Morning Dirt.... It's my understanding, the aging process at 50 deg. F, promotes bacteria to break down the meat and subsequently attain a richness that can only be found in that process...
If the meat has lost an "adequate" amount of moisture while in the fridge, and there is adequate salt, (around 2.7% ish, when the process started), then the continued aging process at 50 deg. F is fine... It is also my understanding, the UMAI dry bag is basically a synthetic replacement for natural casings... bungs, middles etc... A protective layer that allows for very slow dehydration... Charcuterie of the money muscle, as an example, is started in the refer for a few weeks for initial bacterial control.. ., then moved to an environment for continued aging...
Marianski on coppa....
Add the cure, salt and spices... place in zip bag for 7 days in refer... rerub the butt with the remaining cure stuff and continue in the refer for 10 days... rinse, add more spices, dry for 3 hours in the refer then stuff in a bung or collagen casings... prick to remove air pockets... Hang and hold for 21 days at around 55 deg. F, 70% humidity to dry and mature... DO NOT go over 59Deg. F... It is OK to cold smoke anytime below 65 deg. F... I would stay below 59 F.....
Looking at the 2 methods... I don't see a problem intermixing the drying processes... end results are the same... As long as the UMAI bag is still tight, one might continue to use it as a bung replacement... even spraying a mold 600 on the surface to prevent bad mold from taking over.. Evan Brady used pig skin as a barrier on some of his charcuterie.. I think the primary requirement is permeability... He did poke thousands of holes in the pig skin with a sausage pricker, if I remember correctly...