I'd just shoot them and then clean the bore well once you've shot up the moly coated stuff
pretty sure 10 rounds of non moly will clean most of the moly out of a barrel. Maybe not even that many
Moly over copper over moly over copper can build up some weird stuff though from what I recall. Seems thats also when folks had carbon ring issues in front of the throat at times too.
I'd shoot moly over copper but then shoot a few copper and clean it well. But I would not be totally right with going back and forth.
Google should tell you that fast orange hand stuff IIRC, in corn cob, in a tumbler will remove the moly from the bullets pretty quickly IIRC
