I like this solution. I needed to do something similar today as it happens. I wanted to replace only certain methods, so I put a copy of the CPAN module in a Replacement subdirectory, complete with its parent directory, amended it and: 
use library '/home/simon/lib/Replacement';

use Replacement::Some::Module;

...

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One world, one people

In reply to Re^2: Overriding a module that is used by a program I'm testing by anonymized user 468275
in thread Overriding a module that is used by a program I'm testing by Narveson

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