As things stand not enough is known about calci-worms, so I wouldn’t feed them, especially on their own. There is potential concern that they might have too much calcium in them and could cause problems in that respect i.e. as with humans, kidney stones, heart problems etc. But the calcium levels can be quite a lot different depending on what the worms have been fed – sometimes, apparently literally rubbish. Also, nutritionally, they would be too limited if fed alone, even without those potential problems
Hogs are better off being offered cat, dog or meaty hog food. It sounds to me as if your best bet is to create a cat proof feeding box, which is possible. There are some ideas here: https://www.hedgehogstreet.org/cat-proof-hedgehog-food/
Good luck. Hope one of those works, but if not, there are some other ideas people have tried. Let us know how you get on.