I know for definite CAS coatings do (£1 an inch place) and I'm pretty sure City in Brum do. There is a warning in CAS saying they bake to 500 degrees to remove old coatings
It does seem to depend on the alloy though how they react
Me and my mate had my 106 speedlines and his DC2 wheels done at CAS coatings - they were fine for years and years. I even accidentally jumped a kerb in the 106 and bent 2 of the alloys and some guy bought them off me and had them straightened - they were fine again no cracking at all
Some alloy materials though seem to lose all strength when heated up - apparently it's the ones that are fire hardened to start with or something