I was doing a bit of research and stumbled on SportsCrafters. They make trick trainers for recumbent trikes (tadpole and delta) and handcycles that look to be made well. They have both recreational and pro levels to boot. I may review one if the opportunity presents!
https://www.sportcrafters.com/products/trike-trainers
https://www.sportcrafters.com/products/trike-trainers