Using CM Bright partly

bxcmbright.sty

% bxcmbright.sty

%% pacakge declaration
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{bxcmbright}[2012/09/27 v0.2]

%--------------------------------------- Basic settings

%% math version 'bright'
\DeclareMathVersion{bright}
\SetSymbolFont{operators}{bright}{OT1}{cmbr}{m}{n}
\SetSymbolFont{letters}{bright}{OML}{cmbrm}{m}{it}
\SetSymbolFont{symbols}{bright}{OMS}{cmbrs}{m}{n}
% 'largesymbols' unchanged
\SetMathAlphabet\mathbf{bright}{OT1}{cmbr}{bx}{n}
% \mathsf unchanged
\SetMathAlphabet\mathit{bright}{OT1}{cmbr}{m}{sl}
\SetMathAlphabet\mathtt{bright}{OT1}{cmtl}{m}{n}

%% math version 'boldbright'
\DeclareMathVersion{boldbright}
\SetSymbolFont{operators}{boldbright}{OT1}{cmbr}{bx}{n}
\SetSymbolFont{letters}{boldbright}{OML}{cmbrm}{b}{it}
\SetSymbolFont{symbols}{boldbright}{OMS}{cmbrs}{m}{n}
% 'largesymbols' unchanged
\SetMathAlphabet\mathbf{boldbright}{OT1}{cmbr}{bx}{n}
\SetMathAlphabet\mathsf{boldbright}{OT1}{cmss}{bx}{n}
\SetMathAlphabet\mathit{boldbright}{OT1}{lmss}{bx}{sl}
\SetMathAlphabet\mathtt{boldbright}{OT1}{lmtt}{b}{n}

%%<*> \brightmath
%%<*> \boldbrightmath
\def\brightmath{%
  \@nomath\brightmath
  \mathversion{bright}%
}
\def\boldbrightmath{%
  \@nomath\boldbrightmath
  \mathversion{boldbright}%
}

%--------------------------------------- Advanced commands

%%<*> \bright
%%<*> \unbright
\DeclareRobustCommand*\bright{%
  \@nomath\bright
  \bxqb@convert@mv{bright}\math@version
  \mathversion{\bxqb@res}%
}
\DeclareRobustCommand*\unbright{%
  \@nomath\unbright
  \bxqb@convert@mv{normal}\math@version
  \mathversion{\bxqb@res}%
}

%%<*> \mathbright{<math>}
%%<*> \mathunbright{<math>}
\DeclareRobustCommand*\mathbright[1]{%
  \nfss@text{\bright$\relax#1$}%
}
\DeclareRobustCommand*\mathunbright[1]{%
  \nfss@text{\unbright$\relax#1$}%
}

%% \bxqb@convert@mv
\def\bxqb@convert@mv#1#2{%
  \expandafter\let\expandafter\bxqb@res\csname
   bxqb@mv@#1@#2\endcsname
  \ifx\bxqb@res\relax
    \def\bxqb@res{#1}%
  \fi
}
\def\bxqb@mv@bright@bold{boldbright}
\def\bxqb@mv@bright@boldbright{boldbright}
\def\bxqb@mv@normal@bold{bold}
\def\bxqb@mv@normal@boldbright{bold}

%---------------------------------------
%% all done
\endinput
%% EOF