Not sure of any components to reduce the rear suspension, you could reduce the rear preload a bit, to allow more the rear to sag a bit more (as long as you don't carry too much weight.
You could also raise the forks so the fork caps show through the yolks 1/2" or more would help.
You mention reshaping the seat, did you know a that there is a low seat option from Honda for the 650?
Just some thoughts, hope that this helps.
Phil
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650 Transalp
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