Hi RAS...NO...I wouldn't touch it with anything abrasive myself....do you have access to an ultra sonic cleaner?, think thats`what they are called .Take the wood of and clean locks n action in one.That will clean any grime off from the metal & in the engraving , but leave the patina.
But wait for more informed info than mine before proceeding with caution...
Sounds nice...Got any pics?
cheers
franc