Sure. I mentioned we have decent salary negotiating power because for many other industries that's the #1 reason to unionize, but I don't think many tech workers would find it compelling.

Also, I'm not entirely sure your case is proof that there isn't a big supply/demand difference. I would be very unlikely to hire a developer 10 hours per week because software is collaborative intellectual work, and I'd have a hard time using somebody who wasn't around for much of the thinking and constantly needed to be brought up to date. Their efficiency (in terms of hours of actual coding versus hours of communication and keeping up with codebase changes) would be low, but their cost in terms of time spent by other workers would be at least the same.

Occasionally I'll see small units of work that could safely be done by part-time contractors working on something solo. I definitely looked for this at my last startup, as my cofounder was correctly eager to accelerate things. But it was pretty rare that I found things where the cost/benefit ratio was at all decent.