darks your wheel looks amazing i am just in awe every time! And yes you're right you do need a new wheel badge!
Dallas Custom Wheels advised they can't do flat bottoms because it alters the shape of the wheel, but adding padding and thumbgrips is no problem.
and MANGO, yeah he said he had a wheel in stock with M tri-stitch that he sent pics of. Ask him to send to you pics of it!
Another option some might like is
www.cobywheel.com to have it completed rewrapped in Alcantara, a lot of E90 guys seem to post about the service with great feedback. If I had piano black or Titan Silver trim i'd highly consider it, but with the wood trim I don't think mixing alcantara will work, too much luxury/sporty clash going on. Also, I don't think they add padding or thicken the thumbgrips like some of us are going for, just straight up rewrapped in alcantara, either gray, black, or colors.
A bargain though if you already have an M3 wheel and want it wrapped, i think its like 200-220!