I've been looking for something like this and basically, no, not unless you want to be a freelancer or contractor. It just doesn't make sense for companies to hire at part time levels when they can just use contractors instead.
I would totally hire a part time person for 80-100 hours a month if they're highly self motivating and a GSD personality. There are also places like Holland where you can typically get a job and then request to work fewer hours (with a relative pay adjustment) and this is protected by law.
Yes there is, although it's rare
Here is what I'd do if I were you:
Build a list of all the companies you could/want to work for
Build a list of all the linkedin profiles of their HR/recruiters/talents or (co)founders for small startups(you can use phantombuster or a custom puppeteer scraper)
Find all their emails using wiza, dropcontact or a similar tool
Use a mailbox warmer for a few days/weeks to prepare your mail address to send lots of mails without getting flagged as spam
BCC all of them asking if they'd be open to hiring part-time (or use lemlist)
you can also send automated linkedin invites/messages to them
Dutch companies have this culture. More than half of the population works part-time. You might have some luck there.
Add yourself to the 'Freelancer?" thread on https://news.ycombinator.com/submitted?id=whoishiring
The seemingly unethical but I think totally okay way:
Job hop until you find a chill job that allows a hybrid schedule, or start one and move away, asking to go remote.
Work very hard 4-5 hours a day, and the rest of the time is yours. You might actually work harder than most people staring vacantly at their monitors and sitting in meetings.