So they don't, but there's a link to someone who does. I've not used him directly but have used Devon rim Company in the past when he was there. https://drwheelbuilding.com/BMW-Wheels/
Last time Mikey did a GS he had the wheels done by an wheel builder - they are a specialist job and even folk like Devon rims will not touch them.
Just cut out the middleman and go straight to someone who understands the problem.