Even M5stickV has 3 buttons now. After an update, power button can be used to navigate(go back).
DIY version Dock navigates using a rotary encoder.

-Android:
I don't know how old Androids will handle the app. As the app doesn't require anything fancy I hope it has some wide range of compatibility. I have some cheap, but not old phones to test. If you try let us know if it worked.
- Linux, Windows, Mac
If you have a PC running python, on any OS, by installing some requirements you can also run a very functional simulator from source code. It's a very good to start point to play with Krux code.