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Sorry to be so late but you could make a "raft" using the lids from jars, not the flat ones but the rings. I used cheap plastic zip ties to keep together. It worked. I tried one time without and had catastrophic failure. As in exploded jars, the whole batch. It wasn't pretty.
I have also used my big stockpot for canning, in fact I did so LOTS of times this past canning season. I have used cotton dishcloths, canning lids, canning rings, and a layer of aluminum foil on the bottom of my stock pot.