There aren't any really great products out there for this that I'm aware of. You could try messing with spacers. Complain to Wahoo. Maybe buy things that will work together in the first place?

Also, you could buy an inexpensive road bike with Shimano or Sram or Campy 11 drivetrain and permanently install it on the trainer. Would save wear on your nice bike and require less fuss swapping between on road and indoors.