Perhaps you could use a Throttle Rocker? It would allow you to twist the throttle by pushing down with the palm of your hand, rather than entirely via clamping/twisting with a fist.

When I was 16 I rode with my right arm in a cast, don't remember exactly how I managed but I did it.
This worked for me when my wrist was getting sore and was not using cruise on my 1800Perhaps you could use a Throttle Rocker? It would allow you to twist the throttle by pushing down with the palm of your hand, rather than entirely via clamping/twisting with a fist.
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