My engineering advice is your complicated solutions to avoiding the results of screen glare and the results of background noise would be to clean up at the source rather than at the symptoms. Don't require exotic vision hacks to work around screen glare if you invest in good lighting and top quality matte screens, don't require special comfy headphones if you're in a good (quiet?) acoustic environment. If your environment sucks, change it don't adapt to it
You do correctly implement that strategy with posture and the chair, I've met many people thrilled to spend tens of thousands of dollars and hundreds of hours on chiropractic and back pain therapy just to avoid spending hundreds of dollars on a really good chair and hours working on posture, meditation, tai chi type stuff and/or stretching.
I really hate to walk away when I'm on a roll, my mind is really in the moment and has a list of to-dos that is 100 items long. If they are floating around in my head, it does interfere with sleep. I keep graph-paper notebooks with sewn bindings, which have a bit of permanence, and pick up a pen and get them out of my mind so I can close the day.
I think what would help others in similar situations would be advice how to get out of those situations.
http://24ways.org/2014/dont-push-through-the-pain/
http://ergoemacs.org/emacs/emacs_hand_pain_celebrity.html
http://www.cs.princeton.edu/~arora/RSI.html
http://markmcb.com/2014/10/13/severe-hand-rsi-pain-and-recov...