First and foremost shady -- are the rims clearcoated or not. Most of your replies above are for bare metal rims -- if however they are clearcoated, (which some MT's are/were) you may want to re-think your approach.
Either way, personally, I would probably refer the customer to a local wheel polishing shop, for I just wouldn't wanna mess with the 2+ hours per rim to get them back to new, nor do I think the customer would wanna spend that kinda money. I'll add that if I was in a fixed location, and/or these were factory rims on say a '72 vette being restored, it'd be quite a different story -- I'd have the customer drop off the vehicle overnight and send the rims out to be done. Then mark-up accordingly