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https://guix.gnu.org/manual/en/html_node/Defining-Package-Va... -- section 9.3 of the Guix Reference Manual at least answers problem 1 for you, I believe. I think 2 is possible, and not sure about 3.

I was more a happy Guix user and computing beginner, rather than an expert, I didn't do anything overly fancy. I was starting to dabble with more advanced topics, but had to leave that system unfortunately for unrelated reasons. Looking forward to a glorious return though, I must say, as soon as I can manage it.

Don't hesitate to try the official documentation with your problems, it's excellent. No answer there, try a full description of your issues on the mailing list, they're a great bunch too.

Search the help-guix archive here before emailing them -- https://lists.gnu.org/archive/html/help-guix/

Details on joining the help-guix mailing list, and/or where to send questions, here -- https://lists.gnu.org/mailman/listinfo/help-guix