My car came with 255x45x19 which is 28.04 tall. It also came with a spare tire setup. I don't know it's dia. but Ford sells this setup so it should work temporarily if you trust Ford??
Looks like your 285x35x19 is 26.85 tall. I would think that dia will work.
Probably a dumb question but would appreciate input. I'm on a 19x10 square setup now with 285/35/19 tires. Don't have brembos. Will the factory spare wheel be fine to use if needed?