In my opinion, simmer the skin in just enough liquid, standard mirepoix, aromatics until very tender. Cool the protein and save the broth - reduce if necessary checking to see the binding of the gelatin.
Cooled skin / protein can be ground or chopped and folded into anything and broth used to bring it all together. ie: souse, head cheese,
Consider simmering with white wine and appropriate aromatics. Some vinegar will help.
After the loaf comes together and chilled, some pickle and / or capers and favorite good mustard when we serve it forth - sliced.
