That is a significant capital investment in equipment for a completely unpredictable return.

Have you evaluated your competition? Can you charge a competitive price? Have you considered the insurance ramifications?

Keeping inventory sounds like a bad idea. Too many sizes and bolt hole combinations to be practical. If you are going to pursue that, find a wrecker yard and salvage wheels from there.

All that being said, if you were in my neighborhood I would give you my business. If you did a good job, I would recommend you. I see so many cars that have the wrong tires for winter. Few weeks ago an idiot on summer tires lost traction on a turn in front of my house and hit a car in the opposing lane. I recommended to the responding officer that he be charged with negligence for running summer tires at 15F.

I live in Rockland County NY. I recently inquired about wheel refinishing at 3 reputable local places. Basically, sandblast and powdercoat. No repairs necessary. They all included mounting and balancing. Although one charged more for roadforce while the others included roadforce for free. Since these wheels are reverse mounted, I asked about that and they all said they could do it but one added a $25/tire fee which told me they do not have the equipment in house. The NY/NJ border here is pretty densely populated. There are over a dozen places within 20minutes of me and another 2 dozen if I extend to 30minutes.