I've learned a lot, and it turns out that worms come in at least two varieties-- surface & subsurface. The trash-eating worms are the surface type, normally found on pig & cattle farms where they sit at the base of the grass and eat whatever splats (so to speak) on the ground next to the animals. The local worm company has some difficulty finding people who will hunt wild worms (even for pay), so ours were bred "on the job".
As for rotating composters, [-]if you listen closely you'll hear them going "Wheeee!"[/-] they don't care. And the worms are just one of many other types of critters (compost mites, earwigs) that live in the muck. The worms don't actually eat the trash, they slurp up what's left after the other critters have broken it down. They only reproduce to the extent of the available food, so they won't disturb the eco balance. If you stop feeding them for a couple months they'd work their way through the last of it and die off.
The best resource in your area is a library copy of the book "Worms Eat My Garbage". There's also info at Waikiki Worms:
Waikiki Worm Co.: Home
Don't know about that winter freezing stuff and I doubt they'll survive. I don't think they'll bury because they'll lose their surface-supplied food source. Ours live happily in our kitchen right next to the aquarium...
You're exceedingly brave to tackle Hawaii drivers armed with only a scooter. It's a completely different set of problems from CA & NYC & Boston, mostly involving "fear of passing", "sympathetic braking for no reason", "random lane-changing", and "Scooter? What scooter?"
Hawaii lacks a helmet law so the situation usually comes to a Darwinian conclusion...