Is anyone successfully using Ankidroid with a gamepad (e.g. Wiimote) on a treadmill?

I've been digging quite a while and haven't found much, especially nothing recent. I'd really like to get a treadmill setup working so I can fit an hour on the treadmill. Holding my phone in hand is impossible.

I found this, and this, and this, but they don't seem like vetted solutions. I was even considering ripping a bluetooth keyboard apart and making some kind of ergonomic handheld device with only a few buttons.

Suggestions?