I agree that multiple stoves and pots is the best solution for this problem. One person (the cook) can easily handle 4-6 stoves at the same time, some boiling water, some cooking noodles or heating sauce or whatever. (This is how one cooks at home, on a 4-6 burner stove, often with a microwave going at the same time.) This will me much faster than trying to heat 10 liters of water in a single pot.

Liquid fuel stoves would be the best choice, I think, both for the cost of fuel and the BTU content.
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--Ken B