You should be able to bypass the unit thermostat and utilize the wall mounted thermostat only.
How to install a double pole wall mount thermostat.
Make sure to connect the ground to the thermostat or wiring box if available.
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In my experience the wall mounted unit will control the temperature if placed in the appropriate location.
Double pole 22 amp 120 volt 240 volt wall mount mechanical non programmable thermostat in white designed to replace most wall mounted line voltage thermostats 4 wire thermostat with color coded wires for easy installation.
Stop the next steps will differ depending on which thermostat you are installing for single pole thermostats.
Typically this is marked l1 or line step 8.
For one thermostats situated in the lower 6 inches of a room are not accurately measuring temperature since cold air sinks.
Then remove the thermostat from the wall.
While this type of installation is easiest since it does not involve opening up walls it is considered to be inferior to installing the thermostat on the wall.
Two of these are live wires and two are load wires.
Since you are working with a double pole thermostat there should be four wires.