Lots of VR headsets have a small webcam, and can show its viewpoint as a HUD element in the headset. That's enough to keep track of your bearings, then you just need a normal mouse and keyboard (e.g. the laptop you already own). No need to revolutionize on the input front if all you want is lots of private screen real-estate.

You can have this right now from multiple VR headsets (Lenovo comes to mind as a company that puts a lot of emphasis on this use-case). The issue is the resolution of most headsets is pretty low for this usecase, so you end up with pretty low-resolution virtual "screens".