I don’t know what the mechanics of the heater lever are but I built a throttle lever for my efi and while most of the parts can be found online at Pelican, google, and eBay, there were a few critical washers that I had to source externally at McMaster and one absolutely critical one that I couldn’t find at all that I had to fabricate.
If you can weld or can fabricate stuff it will be no problem at all… if you’re looking for a drop-in bolt on solution… I’d reconsider and maybe look at a IAC valve.
I did make a post somewhere with all the part numbers.
Found it:
https://forums.pelicanparts.com/porsche-911-technical-forum/1067600-2-7-x-faktory-pmo-efi-upgrade-18.html#post11818582