So... I did a thing today and fitted a pair of F82 M4 front seats. I also managed to snag a full set of Individual piano black interior trims, which should be the last interior mod (touch wood)!
All electrics except for seat heating and light up ///M badges are working. My car did not come with seat heating from the factory so I'm pretty sure I just need some buttons and a bit of coding, the lighting will need to have a bit of custom work done
Super glad I held out for a pair of these instead of settling on a pair of e9x heated seats, these totally change the feel of the car.