Not too long back I bought 3 gammon shanks for cheap from a local butcher, and after I used them up, I kept the bones in a bag and froze them to hopefully use for homemade tonkotsu ramen broth (there's also some big fatty rind pieces as well but idk whether they're useful or not). I thawed them out yesterday and it only just occurred to me to ask if I could actually use these for tonkotsu in the first place, I've put a picture of the bones above for context.

I also purchased some pork belly slices that are about an inch thick and 5-6 inches long to use for chasu since I couldn't get a full pork belly, can I use either of these things to make a good tonkotsu ramen? Or should I just use them for something else instead. Any help appreciated, I can add more information if needed/asked