You could do all that and maybe after many hours it might work, or you could also solve this in 5 minutes by just plug in the magic keyboard to the computer, st

You could do all that and maybe after many hours it might work, or you could also solve this in 5 minutes by just plug in the magic keyboard to the computer, stick it in a box with a cut out for the touchid sensor, and just stick your mechanical keyboard on top of the box.