Wheels and tires are still available.
I was really happy with swapping the M3P stock wheels and tires for the 18" + the DWS06 tires. Did not really notice a major difference in handling but the ride and noise were definitely better. I will admit the car doesn't look as cool with the smaller wheels but maybe while you're inside enjoying the ride you don't care?
Just a note that the TPMS sensors are the versions for pre-2021 cars. So you would have to swap in new Bluetooth LE ones if you have a 2021-2023. Now T Sportline sells sensors that work with new and old models but they didn't have those a year ago.