I have an early 90s Marin Team Issue in nickel plated steel. Before I had it it had been modified for disk brakes and had had a few cable guides fitted to the frame, plus a holder for the rear brake caliper welded to the rear triangle as shown in the attached photo.

I am now considering returning it to caliper brakes and would like to get rid of these added bits. The nickel plating is not in good condition so I want the frame powder coated.

My question is about removing the added bits. I could cut and file the cable guides without any damage to the frame, but am not sure about the rear caliper holder. Can I get an engineer to take it off with heat or will this damage the frame? It's not the end of the world if I can't remove it before powder-coating, but it just wouldn't look as good

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