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The magnet will attract ferrous metals. Any metal with iron in it will be attracted including steel. Aluminum doesn't have enough in it's alloys to be magnetic.

You could still do a lot of...

I'd be surprised to find out that they were steel. How sure are you? Do they cling to a magnet? (Just an indication) Do they rust?

I don't have any knowledge on historic materials for razor...

Yeah, I can tell you from automotive experience that Steel and Aluminum aren't good neighbors. Same with Steel and Fiberglass resin. I think if I were you I'd go for a cherry wedge, or some other...