There are 19" RFTs for sure in 225/35 and 255/30 since that's the OEM size BMW uses for E9x 19" wheels. The problem is the OEM E9x 19" wheels are 19x8 front and 19x8.5 rear. AG M359 are 19x9 and 19x10, and people generally run 235/35 and 265/30 on aftermarket 19's. Not sure if you can get the RFTs to stretch that much, since RFTs are supposed to be a pain to mount even on OEM wheel sizes.
Just run regular tires. Buy a plug kit and compressor if you're worried. Even if you have to call a tow truck, you'll probably still come out cheaper with regular tires than getting 19" RFTs.
AW/Terra | ZSP | ZPP | ZCW | iDrive | CA
Mods: BC BR coilovers | Blacklines | M-tech rear | dual exhaust | M3 steering wheel | BMW SSK | ZHP shift knob | High-kick CF spoiler | NBT Retrofit
M3 front control arms | M3 rear guide rods | Manzo rear toe and camber links | Monroe rear shock mounts | Varrstoen ES1 19x9.5+20 Front, 19x11+25 rear