I'm sure plenty have already thought about doing it, however, I'm sure Tesla won't make it "easy" in any way knowing them. For one, I'd be absolutely shocked if they'd just work with the built-in HVAC controls out of the box. Two, I'm sure they'd never go for it because they'd hide behind some safety related issue about how the seats could no longer be trusted since they were never designed or tested in that body/model. Finally, they'd much rather you just buy an entirely new disposable vehicle instead of helping you hold onto your existing ride for all of the reasons you can imagine.
FWIW...even though I despise the worry about having light colored seats...heat/hot/hades-like backside temps is why I went to a MYP with the white interior.