You can ground your metal cockpit to a ground-point in your wall outlet, provided there is one.
If there isn’t, go buy a good 500-600mm x16mm copper rod and hammer it 400mm into the ground outside your window, run a 5-6mm dia cable from your rig to it, if it is practical to do so. This method normally works very well for houses without a ground-point.
From my experience, Simucube-based osw doesn’t suffer from emi, it should be referred to as ground-loops rather, as this is what is causing small issues with button-boards sometimes. But anyway, a trivial matter to resolve.
SC2 won’t have any related issues due to careful engineering and design. Again, if a button-controller acts weirdly, that should be grounded to your QR on the wheel-base.