Weldabeast and I were just talking about this exact thing. He said a jx3 would be the ticket but when you use a jx3 as a chair, you have to sit on the ground ground and I can't shoot a stickbow with my butt on the dirt. Seems like you'd have to make legs for the jx3 to make it a chair.
The other thing the jx3 doesn't have, or at least I don't think it has, is a hammock-style seat. I have a compressed bone in my back/butt that doesn't allow me to sit on hard surfaces for more than a half hour or so. A hammock is a bit better for me.