Edit: I should probably actually link it, since people might see this! https://www.microsoft.com/en-us/store/p/vncaster/9nblggh528q... Don't judge the text by the screenshots; for whatever reason, they threw a 640x480 camera on the front, and downscale everything for that. What looks like magic in real life, looks like shit in screenshots. If they don't fix that with Hololens v2, there's a serious problem with their priorities.
I would get one of this instead of buying several monitors.
Samsung recently demoed live-coding VR in VR on a GearVR using http://www.gearvrf.org/ Note the use of green-on-black text to get the best clarity out of the pentile screen http://imgur.com/a/ZL32K