Welcome to CF!
On your question. My thinking is that if you can't switch to such propellers, then a whole bunch of folks all screwed up severely in signing off on your propulsion
units. As they need to be able to handle a lot more thrust then you'll ever be able to apply via prop changes.
That said, they're the ones that you need to ask, given that they built them.
Have you considered going to feathering props at all? That way you get to have excellent handling characteristics under power, & retain having little drag from your props when under sail. Those qualities & more have kept me as being a Maxprop fan or several decades.
PS: Which of Kurt's designs? I'm a bit jealous as he draws some nice boats.