

A wiki would be great, since it allows user contributions and a familiar interface.
Not necessarily mediawiki, though. Or maybe something that allows people to submit individual options in a category and vote on them.
Get it running and set it loose!
System76, Framework, even Dell officially supports Ubuntu in limited cases.
I’d just try a couple different distros and see which one has the fewest issues for you. If you like, you can pay for official support from Dell or Canonical. If you do identify an issue in a supported scenario (Ubuntu version + device model) they will actually help you troubleshoot and resolve the issue. RHEL is the same if you want to pay a bit more.