Finally managed to get some waxworms to successfully turn into moths. Of the ~50 I picked up about 6 weeks ago, I now have 4 moths and have only pulled out about 10 dead worms. More moths should be on the way, and hopefully some breeding will follow.
My last attempt was a dismal failure, with the entire batch of 50 dying either as worms or pupae (a few were thrown to the frogs of course).