G'day AssetXero,

Welcome to the Monastery.

I was looking into something a few years ago which seems rather similar to what you're after. Take a look at "require() @INC hooks problem". That's a rather long thread; you may gain something from reading it in its entirety; however, if you feel TL;DR setting in, "Re: require() @INC hooks problem [SOLVED]" contains links to the most pertinent parts.