access custom/user hyphenation pattern files

[jarnowicz]

Description

How feasible is to implement access to a user's hyphenation pattern file, locally maintained?

Use Case

I fear trying to integrate every language into the executable may become impractical, and there's still room for custom/personalized applications of the language choice: with Lua|XeTeX I typeset my drafts in a mixture of greek/latin, thanks to the divergence of the alphabets in the unicode blocks.