Mate, being a military collector for most of my life, my advice is DO NOT POLISH IT! Leave it be - patina is value, and every micron you rub off polishing devalues and destroys it.
As to the holder, yes, I imagine regular solder would suffice. Probably lead solder of course for period correct.
If you don't have any 303 brass, give me a holler - I have a couple kg's of it - most WW2 Aussie manufacture (yes, I shoot it to be even more historically correct)
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