... what I would really like is to map a string to the code reference of the function itself ...
If you mean an arbitrary string, the following is one way.
>perl -wMstrict -le
"my %f_map = ( glue => \&foo, );
;;
print $f_map{glue}->('hoo');
;;
sub foo { return 'FOO' . $_[0]; }
"
FOOhoo
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