I think I've had tofu jerky that was pretty dang delicious.

I wonder how hard it would be to make your own jerky with seitan and/or tofu. It seems like it shouldn't be difficult, unless you are particular about the texture. Just cook with seasonings and then stick into an oven at a low temperature for a while. I think inari tofu skins might be a good starting point. I'd personally also experiment with tofu-kan, especially with freezing it first, to give it holes from the ice crystals to increase surface area to hold onto seasoning and give it a fun texture.