I think most bearings can still be got if you put the time into looking. Honda dont list bearing on their own anyway for the cranks. If the worst came to the worst you could always fit an RS crank into it anyway and go the F3 route!

My '18 has quite a few miles on it and so far the crank has been perfect. Dont let things like that put you off.
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If I have to take the carbs off once more...