@dimitri I'm just getting this set up myself. I built a dashboard with Sharptools.io and I'm using Fully Kiosk Browser on a fire tablet. Sharptools has an integration with Hubitat and has tiles for controlling HSM.
A bit late, but in case you haven't found a perfect solution yet have a look at
It's a free Android Dashboard that can control HSM as well as all your Hubitat devices. And for HSM you can set a PIN so when you try to enable or disable HSM an intruder couldn't do it without knowing the pin