It's a different cut, entirely, but typically for pork butt, cushion, or shoulder, I slow cook it for hours to a final temp of 170-180 using a Hamilton Beach slow cooker with temp probe. It takes the higher temp to soften all the cartilage. Lower temps work but the final result is more chewy. The broth and rendered fat make for a fine gravy.
From what I've read, there is one strain of trichinosis that is killed by freezing. But I wouldn't count on it. 145F is probably high enough to kill off the others, but a little margin probably is not a bad idea.
Off topic even further, how many people know that one should never eat raw cod or similar species? It can carry a nasty parasite, and needs to be cooked to at least 145. Again, some such parasites are killed off by freezing, and suchi/sashimi chefs routinely freeze their fish before thawing, slicing and serving. At least that's what I've read...