If it's an OrangePI (don't know what an RPi4 Orange is) then Stellarmate most likely will not work with it. On my Orange Pi 3 LTS I had to use their Ubuntu install routine and roll my own KStars/EKOS system.
I also tried using Armbian with it, but had issues with the WiFi driver in Armbian not working with the Orange Pi 3, which was an immediate killer. It had to do with the kernel not being set up to support that chipset.
I haven't tried any of the newer Orange Pi devices (the 4 LTS or the 5 series) since I went to a NUC based solution using StellarMate X OS.

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