I’d suggest putting Android on your RPi and then installing HabPanelViewer. That way, you can also use the value-reporting features of HPV to turn the display on and off.
Android on the Raspberry Pi using LineageOS - Pi My Life Up.
I have no idea if this will work with your touchscreen monitor, but if you’ve already got the hardware then there’s no cost. You don’t even need to install GApps, since you can get HPV from GitHub (you’ll need the 0.9.27pre build).