You've lost 115 pounds and still losing. Congratulations---that can't have been easy with pain and limited range of motion.
I don't know the answer to your question, but it would seem logical that if you get a boat that's rated for 300 or 325, it should do okay now and even better as you reach your goal of 225 or less.
Touring Kayak Paddles
Pull-Up Strap Handle Kit
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