I'm going to suggest something strange and almost embarrassing. It's not for the office, unless you have a very relaxed work environment. Get a cheap, folding "zero-gravity" lawn chair. This sort of thing (...though perhaps detach the beer can holder):
If your tastes are more haute couture than mine, or indoor patio furniture doesn't match your decor, there are more elegant version of the same "zero gravity" idea. Versions with wood and leather and padding and so forth. But my tastes are simple, my aesthetic sense is stunted, and it is the most comfortable I have ever been working at a computer.
I use a desktop computer, with monitors at about the same height as one would find them at an average desk (surprisingly), just tilted downwards a bit. Mouse + keyboard sit on a long tray that rests across the chair arms, over my lap.
I don't use much paper, so I haven't needed a larger work surface than the foot or two of extra space on the tray. (Obviously this isn't true for everyone.) If I find myself in need of work area in the future, I plan to build or buy a wheeled "overbed table".
>The zero gravity chair idea reminds me of this insane thing: ...
Yes, that insane thing and the other commercial variations of it were part of my inspiration to finally try this. I had wanted to create a reclined setup for years before seeing them, but learning that I was not the only one with such a weird idea validated my beliefs enough to actually try it. I could have splurged on something insane like that. I am, after all, presumably the target audience. But I didn't want to spend thousands of dollars on an experiment, especially if I was buying something hideous and overbuilt. Thus the super cheap, goofy setup I'm using. (Which is hideous, but at least it's hideous for the good reasons of expense and experiment.)
I had expected - if my experiment worked - that I would quickly want to upgrade to a nicer zero-gravity chair. But it turns out these cheap chairs really are damn comfortable. So until I have a "Lenny moment" as in [0], I don't think the impetus to get something nicer-looking solely for the sake of it being nicer-looking will be very strong. (Of course, this will change if I return to an office environment. I'll have to figure out something that won't get me odd looks, because I can't imagine myself going back to upright chairs.)
https://www.amazon.ca/Goplus-Folding-Gravity-Reclining-Outdo...
You'll need a monitor mount to give enough space.
If your tastes are more haute couture than mine, or indoor patio furniture doesn't match your decor, there are more elegant version of the same "zero gravity" idea. Versions with wood and leather and padding and so forth. But my tastes are simple, my aesthetic sense is stunted, and it is the most comfortable I have ever been working at a computer.