I did a similar trick with tires+wheels as well, motivated by a need to go over a dam spillway that's all river rock a couple times a month.
I'm quite sure the OEM Conti's would not like it, and this setup gets 1/2" additional ground clearance.
Like the OP, I've discovered (proven) that tire sidewall buys significant composure for the ride quality of the MYLR.
These are BFG Terra-Terrain A/T tires sized 255/55/18, mounted on M3 18" Aero wheels. Unfortunately the shop's insurance required the addition of TPMS sensors.
Notes: these wheels won't clear the MYP brake calipers, and there's just 1/8" wheelwell clearance at full lock steering (NBD). Steering knuckle has 3/8 clearance, very good.