bash: any idea how to use the readline function 'history-and-alias-expand-line' in a recursive way?!

x.sh

#!/usr/bin/env bash

# Method 1

bind -x '"\C-x4": history_and_alias_expand_line';
bind '"\C-x3": history-and-alias-expand-line';
bind -x '"\C-x2": READLINE_LINE_OLD="$READLINE_LINE"';
bind '"\C-x1": "\C-x2\C-x3\C-x4\C-x5"';

function history_and_alias_expand_line {
    if
        [[ "$READLINE_LINE" == "$READLINE_LINE_OLD" ]];
    then
        bind '"\C-x5": abort';
        unset -v READLINE_LINE_OLD;
    else
        bind '"\C-x5": "\C-x1"';
    fi;
};

# Method 2

bind '"\C-x2": history-and-alias-expand-line'
bind '"\C-x1": "\C-x(\C-x2\C-x)\M-100\C-xe"'

# vim: set ts=4 sw=4 tw=0 et :