Are you certain is is a Legend?
Back to your original question you can put a rudder on any boat you just need the right parts and skills and tools. I imagine the shop didn't want to do it because they do not have a skill boat repair man there. Or maybe they did not want the word to get around town that they put a rudder on a Legend.
I'd do it for you but you'd have to promise not to tell anyone I did it. :)
Duckworks has all the parts you need.
URCHIN Portable Anchor
Kayak Deck Gear Bags
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