It’s good to hear about the hedgehogs there. I expect they will be going to hibernate quite soon, now.
With regard to the food, it would be better for the hogs if you stick to the Spikes and give the sunflower hearts and mealworms a miss. Mealworms and to some extent sunflower hearts don’t have a good Calcium to Phosphorous ratio, which means that calcium can be leached from the bones. This is particularly dangerous for hoglets, and they can become ‘addicted’ to them. There are hoglets around now. Also with hogs about to hibernate they need the very best nutritionally good food we can give them. Sorry, your 1kg of Spikes may increase, but the hogs will be better for it. If they don’t like it to start with, just add a few mealworms and reduce them gradually.
You might like to check out:
You are lucky that a hog is using your specially made hog house. Makes the effort all worthwhile.
Good luck with the hogs and I hope they all come back safely from hibernation next year.