I'll update this with what i've found in case anyone else is curious. I looked up on a parts website, the front and back bumper carriers are the same on the m series as regular, so you would just need to change the bumber cover and the fender flares.

I'm not 100% certain if the fender flares would meet up perfectly with the running boards on the regular model, something that might need to be looked into. Also, if you didn't want to change the front bumper, i'm not sure how the larger front fender flares would meet up with the original bumper. Maybe I'll think about just painting the original front fender flares and changing the rear ones and bumper. Randomly, i saw a x5 driving in front of me today with exactly this done. it was a 4.8 so it was not an m series, had the stock front bumper, but m series flares and rear bumper. Looked really clean.