I’m also keen on the Yamaha mouthpiece. It’s really comfortable. When playing a Hammond 44, I use the Suzuki mouthpiece from an M37, as I really don’t like those long pieces it comes with. I don’t use tubes at all, though I have experimented with clear flexible plastic tubing from a hardware shop before. That did work really well
The Hammond gooseneck seems to be a good rugged solution. A longer one would be even better!