@mauve hmmm .. ?? hololens is an AR headset specifically ... what do you want from it if not the transparent screen ? (and for that a better one is the NorthStar)
for a virtual desktop check the https://simulavr.com project (if you have the budget)
- but you can also install their windows manager on other (less portable) headsets ...
there is also the https://gitlab.freedesktop.org/xrdesktop/xrdesktop project
& maybe the Lynx-R1 would be an option somehow too