Hi, sounds like you are making good progress. I'm interested to hear how you progress with the controller. I previously hacked an inverter but in a different way to you. One thing I'm interested in is if you have any problems when you remove the power feeds to the air guide and fan motor. Sometimes there is feedback to the controller to detect failures so the machine will shut down if the fan isn't running. Maybe the machine you have doesn't have that so you won't have this problem.
IR blaster controllers are easy to find for Arduino. If you used an ESP8266 you could make it WiFi controlled.
Good luck with the project. Maybe some of my posts will help you as I've tackled the conversion of an indoor unit to a fan coil using water and several coil heat exchangers.
Acuario
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