If I were you I would continue to scatter some of the food as well as leaving some in the feeding station. If you scatter the food when it is almost dark, or just dark, the hogs have the chance all night to eat the food before the magpies arrive in the morning. If the hogs aren’t visiting at the moment, you could put out a bit less and monitor the situation, increasing the amount again if you see any hog activity. Of course the cat might turn up in the night, but if the food is widely scattered it might not be bothered to eat it all – anyway at least the hogs get a chance and they are quite happy to forage for scattered food.
I would avoid using calci-worms. The jury is still out as to whether or not they are good for hogs, so it’s best to stick to cat/dog/meaty hog food.
Don’t forget to leave water available all day every day, including during hibernation time. You never know when a thirsty hog is going to come along.
Good luck. I hope you manage to find a compromise with the magpies.