Don't own a MGPbox but a very useful way to power on the mount from remote is using wake on lan.
If you have MW4 installed it provides, beside its many other features, a front end for wake on lan.

About windows I had a similar issue: 10micron releases its clock sync utility on windows only, so I have a win10 VM on my intel nuc pc and use that utility running this VM. But virtualbox only runs on x64 and not arm architectures, but you can have another emulator (qemu?) on the rpi4.

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