It would be cool if someone made a double walled roti ring that would be a perfect match up, but the price point wouldn't be attractive. I have seen people use rings on the Summit, but I don't think I have seen anyone really recommend it. The lid does detach if needed, but I wouldn't remove it because that would be an expensive replacement to drop the lid on a Summit.
I would just keep a 22 to use and abuse as a pizza cooker and Santa Maria style cooking(especially if you like wood fire over charcoal). It's also possible to get a roti ring for the 26er which might be the best way to go on roti as it would allow you the capacity for large birds or easily doing multiple smaller birds.
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