It is not recommended by HR, however, MSP Ret gave me the name of a gunsmith who can do it. Many have had it done, just one of those over cautious anti-lawsuit things.
Anyway, the guy is in Mass and he will do it for $45 plus shipping and you send him the mount.
I am in Algonac, MI which is not far from Roseville. If you are serious, let me know, we could save some shipping by sending both barrels at once.