I'm told, but have not tried doing, that a smart thermostat may work. This was from the equipment manufacturer. My understanding was that the wiring was the same. The caveat being the diagnostic data displayed by the OEM thermostat wouldn't be there in the event of a failure. However, their service staff should have a tool which gets around the issue. I'd reach out to your unit's manufacturer to see what they have to say. Possibly the installer as well.
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