The simple bi-metal magnetic furnace thermostat is pretty basic, and didn't offer a decent room thermometer. My search kept coming up empty for a simple 12V digital non battery furnace only thermostat. I called Dometic, and ended up doing the entire Furnace/AC upgrade.
This consists of adding the supplementary electric heat to the rooftop unit, a digital thermostat, a new control box, and a replacement non mechanical (knobs) ADB (air distribution box).
The challenge was thermostat wiring, knowing that I was already equipped with a 7 conductor thermostat wire from the furnace to the thermostat, If I could access it I would be good. The new control box requires the AC 110V, and DC 12V fed directly to it, it then distributes the 12V to the furnace, and thermostat. Luckily I located the thermostat wire in the ceiling over the pass speaker, from here I pulled a separate 8 conductor thermostat wire from the AC unit to the speaker through the ceiling. This allowed me to "T" into the existing wiring and allow everything to happen. Within Dometic's design of the foam enclosure, a pocket was intentionally made to house the control box. The 110V had to be extended too. Everything is now controlled from the wall thermostat, no more knobs on the interior portion of the AC unit. The thermostat will operate the electric heat in the rooftop unit, the furnace, and the air conditioner, it requires no batteries, and has a NV (non volatile) memory. This particular kit did not offer a Bluetooth thermostat, but a stand alone Bluetooth thermostat can be purchased and swapped out with the current one.
Part# 3314998.000
Part# 3314850.000
Part# 3316232.000
Temp readout not photographing well, but is very visible.