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OK, I tested it. It made no difference to switch away from "Cable Select", and I somewhat suspected this would be the case, because, for instance, in the second example/link, the issue most likely got solved by setting the drive to "master", rather than switching from "cable select", if the problem was that "cable select" was automatically setting the drive as "slave", and it being "slave" being the actual problem.

In my case, I set it back to "slave" (by removing the only jumper it had, here's my SSD's doc), and nothing has changed. Again, if I set it to "master", the CD/DVD drive becomes unusable, which would only create a new problem.

I wonder what's the biggest internal HDD / SSD MorphOS users have ever installed on their Mac mini G4s, and if total drive size is indeed the problem, rather than something specific from my SSD manufacturer.
In any case, back to setting things up for USB use...