biggest problem is that they would take a much slower refill rate than with fish. If you add the water very very slowly you should be ok.
Plus bucket transfer is not really going to work. You want to target the dormant stage, which can be lot longer than 3 days. WS is on the host 3 to 7 days, and that forms the basic concept for the bucket transfer.
If you keep the snails in a secondary holding system for 6 weeks then you should be all OK. Preferably a system with algae growth on the glass.