Thanks for the replies, yes, the question is more to ease changing with my injured thumb. I have tried extending the lever lengthways with a mecano type bar and also sticking a grip end to raise my position. Still no help.
You don’t actually realise how important your thumb is until it doesn’t ‘work’ properly. As for gripshift, it might have to be in the future but as my scaphoid was touched, luckily not broken, turning the wrist is still a bit weak. Rob, nice offer, but I’m in France.
My accident was 24th Sept, I was told the thumb heals slowly, it is an inconvenience but am lucky I can still get out and ride.