That's what I would suggest. Some people have problems with them being invasive, but usually vermatids are harmless enough. The most trouble the average reefkeeper will have with them is a bothered coral at some point.
Vermatids are less likely to harm things you like than bumblebee snails are, so I would not get the snails. It's too bad, they're pretty.
There's actually a very similar-looking freshwater snail, called an assassin snail, that's great to have because they eat pest snails. They reproduce in aquaria, but at a slow rate- you buy three, and in a couple months you'll have maybe four. This isn't relevant, but I like assassin snails and they look similar, so now I'm thinking about them.