I find it appalling that there are no options for you. Its hard to find words. You are obviously highly literate and intelligent and could be good value for some one or entity with that kind of remote work. (4 hours a day and not having truckloads of qualifications but interest, software and operating system skills, life experience, maturity and reliability are a good signal to an entity with this kind of work).
Generally Phd’s and credentialled individuals don’t get jobs like the one we discussed, they will move on - niche jobs are the toughest to get, but employers really aren’t looking for elite credentials, just specific talents and trays.
Finding someone with your skillset who will work for 4 hours a day consistently and reliably is tough for employers - the other side of the coin. (Finding a job like this and an employer in this situation is the problem).
Hold on. This post may be buried but it isn’t going anywhere. (You are depressed and rightly so, I don’t know if there are any disability options for that, and you have investigated the system pretty thoroughly). I’m probably irritating you about now, but you know, you did what you could with this post, and risked it, that is something pretty good and very brave. Hang on, hang on, hang on, sometimes at the 11th hour..... (ok?).