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.
Kayak Motor Kit
The Kayak Wing
Pull-Up Strap Handle Kit
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