Love that, I have similar desires to be able to control some climate controllers so I can get a more native bluetooth connection to it and override their programming for fine control of devices and have it never phone back home. One of these days I'll have time to throw an LLM at it, but I've been working on a dead project for 4 years ago I dropped because I realized how daunting it was going to be turn it into a product, but now I've made progress that would have taken me a year, in a few weekends.
I'm not sure. To be more specific, my car has a Delphi MIB2 Standard head unit (which uses NDS.Classic maps). I think the keys are likely to work with all MIB2 Standard head units, as that's how VW categorizes the updates, but I don't know about other MIB versions.
