I'd like to see the other picture. But this looks to be the larvae of one of the Tortoise Beetles. Tortoise beetles love plants in the Brassicaceae family.....such as your radishes.

I already checked into how to separate isopods from the non-worm compost for exactly that reason. It seems easy enough. In the worm bin, I've noticed they tend to loiter near the surface; they aren't really found in the casts. I'm wondering if simply crumbling the stuff while applying to spot and pick out the odd stray will be sufficient. Alternatively, I might try a quick dunk to send them running for fear of drowning. I could try the spread and sun dry approach that's supposed to work with regular compost, but isn't it bad to let your vermicompost dry out?

Grubs..

They aren't as big as the picture and the video would lead us to believe. The largest that I've ever seen wasn't even an inch and a half. But they sure are exotic looking, I agree. You wouldn't believe the damage they can cause to a pretty lawn or pristine golf green!