I don't know about the rest. But your last paragraph is already handled by perl. Just do use lib 'My'; and put a My folder in the directory with your program, and the modified modules in there. Not 100% the same, but it has worked nicely for me in the past.
In reply to Re^3: RFC: Some of my toolkit modules
by eric256
in thread RFC: Some of my toolkit modules
by bennymack
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