drums won't fit over hub over Moser axles

I've never had the issue but I don't think it's too difficult to fix. You're only talking about 0.17". I would measure it with a pair of calipers to get as close to exact as you can and just have the drum milled to match. You may not even have to do that. May can just use a die grinder with cutting bits to rough it and a cartridge roll to make it pretty. Take it slow and test fit often and it should be fine.