So this is now available for pre-order. Take a look (very short video):
This takes you a long ways along toward making whatever plugin you’re running into hardware. It’s a little strange in that it’s only rotary encoders, and they’re detached from the screen image, but I’d guess you’d get used to that after a while.
Plenty of controls here, so everything should be there under your fingers.
It works on both Mac and PC. No price shown, but you can contact them to pre-order.
CORRECTION: They show the pre-order price is €650.00 plus VAT.
More detail at their web-site.
EDITED.