If you will contact any good paint store or department, they should be able to show you paint removers that have virtually no effect on metal or glass. They will have to look at the paint to see if it is latex or enamel. The most that might happen is that after the paint is off, the "patina" that developed where metal was exposed will be darker than the area under the paint. If this is true, the effect can be evened out with appropriate patina solutions.
A paint remover called "Peel Away" might do it. Used to be sold be Sherwin Williams. Put it on as a thick paste. Cover with a special paper. Let sit for
24/36 hours. Remove paper and paste together. will remove up to 20 coats of paint at once. Not very toxic. Not strong smell. Cleans up with water. Gets paint out of cracks and places that are hard to clean with conventional paint removers.John Bassett
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