XKB rules for Poker II in both English (US) and Norwegian (no dead keys), allowing esc to be used as the key to the left of '1' on a full size keyboard. Esc is handled by xcape to allow for dual-role caps_lock.

evdev.xml

<!-- This goes in: X11/xkb/rules/evdev.xml -->

<!-- This file adds the custom layouts (no_poker & us_poker) -->
<!-- to the menu of available keyboard layouts. -->
<!-- This snippet goes above the tag: </layoutList> -->
<!-- ... -->
    <layout>
      <configItem>
        <name>us_poker</name>
        <shortDescription>us</shortDescription>
        <description>English (US) for Poker II</description>
        <languageList>
          <iso639Id>eng</iso639Id>
        </languageList>
      </configItem>
    </layout>
    <layout>
      <configItem>
        <name>no_poker</name>
        <shortDescription>no</shortDescription>
        <description>Norwegian for Poker II</description>
        <languageList>
          <iso639Id>nor</iso639Id>
        </languageList>
      </configItem>
    </layout>
<!-- </layoutList> -->
<!-- ...           -->

no_poker

// This file goes in: X11/xkb/symbols
//
// It switches the esc key with the key located to the left of '1' on a 
// normal sized keyboard. This is handy if you're using dual role
//caps_lock on a 60% keyboard like the Poker II.
// 

// based on a keyboard map from an 'xkb/symbols/no' file

default
xkb_symbols "basic" {

    include "latin(type2)"

    name[Group1]="Norwegian for Poker II";

    // Alphanumeric section

    key <AE01>	{ [         1,     exclam,   exclamdown,  onesuperior ]	};
    key <AE02>	{ [         2,   quotedbl,           at,  twosuperior ]	};
    key <AE03>	{ [         3, numbersign,     sterling, threesuperior]	};
    key <AE04>	{ [         4,   currency,       dollar,   onequarter ]	};
    key <AE05>	{ [         5,    percent,      onehalf,         0x1002030 ]	};
    key <AE06>	{ [         6,  ampersand,          yen,  fiveeighths ]	};
    key <AE07>	{ [         7,      slash,    braceleft,     division ]	};
    key <AE08>	{ [         8,  parenleft,  bracketleft, guillemotleft]	};
    key <AE09>	{ [         9, parenright, bracketright, guillemotright] };
    key <AE10>	{ [         0,      equal,   braceright,       degree ]	};
    key <AE11>	{ [      plus,   question,    plusminus, questiondown ]	};
    key <AE12>	{ [ backslash, dead_grave,   dead_acute,      notsign ]	};

    key <AD01> {	[	  q,	Q 		]	};
    key <AD02> {	[	  w,	W		]	};
    key <AD03>	{ [         e,          E,     EuroSign,         cent ]	};
    key <AD05>	{ [         t,          T,        thorn,        THORN ]	};
    key <AD04>	{ [         r,          R,   registered,    trademark ]	};
    key <AD06> {	[	  y,	Y		]	};
    key <AD07> {	[	  u,	U		]	};
    key <AD08> {	[	  i,	I		]	};
    key <AD09>	{ [         o,          O,           oe,           OE ]	};
    key <AD10>	{ [         p,          P,        Greek_pi,        Greek_PI ]	};
    key <AD11>	{ [     aring,  Aring, dead_diaeresis, dead_abovering ]	};
    key <AD12>	{ [ diaeresis, circumflex, 	tilde, 		caron ] };

    key <AC01>	{ [         a,          A,  ordfeminine,    masculine ]	};
    key <AC02> {	[	  s,	S		]	};
    key <AC03> {	[	  d,	D		]	};
    key <AC04> {	[	  f,	F		]	};
    key <AC05> {	[	  g,	G		]	};
    key <AC06> {	[	  h,	H		]	};
    key <AC07> {	[	  j,	J		]	};
    key <AC08> {	[	  k,	K		]	};
    key <AC09> {	[	  l,	L		]	};
    key <AC10>	{ [    oslash,   Ooblique,   dead_acute, dead_doubleacute ] };
    key <AC11>	{ [        ae,         AE, dead_circumflex, dead_caron]	};

    key <AB10>	{ [     minus, underscore, dead_belowdot, dead_abovedot ] };
    key <AB01> {	[	  z,	Z 		]	};
    key <AB02> {	[	  x,	X		]	};
    key <AB03>	{ [         c,          C,    copyright,    copyright ]	};
    key <AB04> {	[	  v,	V		]	};
    key <AB05> {	[	  b,	B		]	};
    key <AB06> {	[	  n,	N		]	};
    key <AB07> {	[	  m,	M		]	};
    key <AB08>	{ [     comma,  semicolon, dead_cedilla,  dead_ogonek ]	};
    key <AB09>	{ [    period,   colon, periodcentered, dead_abovedot ]	};
    key <AB10>	{ [     minus, underscore,       endash,       emdash ]	};

    key <ESC>	{ [       bar,    section,    brokenbar,    paragraph ]	};
    //key <BKSL>	{ [apostrophe,   asterisk, dead_doubleacute, multiply ]	};
    key <LSGT>	{ [      less,    greater,      onehalf, threequarters]	};

    // End alphanumeric section
    include "nbsp(level3n)"
    include "keypad(ossmath)"
    include "kpdl(comma)"

    key <KPMU>	{ [	Escape		]	};
    include "level3(ralt_switch)"
};

us_poker

// This file goes in: X11/xkb/symbols
//
// It switches the esc key with the key located to the left of '1' on a 
// normal sized keyboard. This is handy if you're using dual role
// caps_lock on a 60% keyboard like the Poker II.
// 

default
xkb_symbols "basic" {

    name[Group1]= "English (US) for Poker II";

    // Alphanumeric section
    key <ESC>  {	[     grave,	asciitilde	]	};
    key <AE01> {	[	  1,	exclam 		]	};
    key <AE02> {	[	  2,	at		]	};
    key <AE03> {	[	  3,	numbersign	]	};
    key <AE04> {	[	  4,	dollar		]	};
    key <AE05> {	[	  5,	percent		]	};
    key <AE06> {	[	  6,	asciicircum	]	};
    key <AE07> {	[	  7,	ampersand	]	};
    key <AE08> {	[	  8,	asterisk	]	};
    key <AE09> {	[	  9,	parenleft	]	};
    key <AE10> {	[	  0,	parenright	]	};
    key <AE11> {	[     minus,	underscore	]	};
    key <AE12> {	[     equal,	plus		]	};

    key <AD01> {	[	  q,	Q 		]	};
    key <AD02> {	[	  w,	W		]	};
    key <AD03> {	[	  e,	E		]	};
    key <AD04> {	[	  r,	R		]	};
    key <AD05> {	[	  t,	T		]	};
    key <AD06> {	[	  y,	Y		]	};
    key <AD07> {	[	  u,	U		]	};
    key <AD08> {	[	  i,	I		]	};
    key <AD09> {	[	  o,	O		]	};
    key <AD10> {	[	  p,	P		]	};
    key <AD11> {	[ bracketleft,	braceleft	]	};
    key <AD12> {	[ bracketright,	braceright	]	};

    key <AC01> {	[	  a,	A 		]	};
    key <AC02> {	[	  s,	S		]	};
    key <AC03> {	[	  d,	D		]	};
    key <AC04> {	[	  f,	F		]	};
    key <AC05> {	[	  g,	G		]	};
    key <AC06> {	[	  h,	H		]	};
    key <AC07> {	[	  j,	J		]	};
    key <AC08> {	[	  k,	K		]	};
    key <AC09> {	[	  l,	L		]	};
    key <AC10> {	[ semicolon,	colon		]	};
    key <AC11> {	[ apostrophe,	quotedbl	]	};

    key <AB01> {	[	  z,	Z 		]	};
    key <AB02> {	[	  x,	X		]	};
    key <AB03> {	[	  c,	C		]	};
    key <AB04> {	[	  v,	V		]	};
    key <AB05> {	[	  b,	B		]	};
    key <AB06> {	[	  n,	N		]	};
    key <AB07> {	[	  m,	M		]	};
    key <AB08> {	[     comma,	less		]	};
    key <AB09> {	[    period,	greater		]	};
    key <AB10> {	[     slash,	question	]	};

    key <BKSL> {	[ backslash,         bar	]	};
    key <KPMU>  { 	[ Escape	]	};
    // End alphanumeric section
};