If you are limited from rescuing a kayak, I agree a canoe could be more challenging in a full on capsize recovery. I didn't have the bit that you couldn't assist in rescuing a kayaker.
That said, if your friends have good float bags in their canoes, it doesn't take so much rescuing to start with. A little stabilizing from you and a lot of bailing from them.
Canoe Pack Liner
Pull-Up Strap Handle Kit
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