A comfort food like this stuffing could work. From your list I would use your celeriac, white & sweet potatoes, country ham, apple, and rye bread. Best of luck!
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Maybe a hash with the potatoes, apples and ham/pulled pork. Or hash with potatoes, tomato and egg on top.

I would make a pork ragu with the pulled pork and tomato/tomato sauce, then crack a few eggs and cook in the ragu for dinner. Serve on the roasted white+sweet potatoes on the side.

okay, a few options:
1. an awesome sandwich
2. stuffing? bread pudding?
3. frittata?
xx

Thanks for the ideas, everyone! I love them all, and will keep each in mind for future kitchen sink-dinners.

I ended up making a shepherds' pie of sorts: pulled pork + ham; leftover apple-y caramelized onions; (pureed) celery root; both potatoes; a few nubs of cheese; and sautéed dark greens.

Thanks again! It's tomato sauce tonight.