challenge to list the skills needed to convert Pathfinder Kingmaker to a classless system.
Without defining restrictions on what counts as a skill, there's nothing to it. Make every class a skill that can be raised independently, done. But the challenge is a strawman anyways since those that have defended classless systems as superior have also argued at length that this should go hand in hand with gameplay changes to yield superior results --- whether a straight port is possible or not thus has no bearing on their argument. I, on the other hand, have been arguing that straight ports are possible because loose notions like class, multiclass, feat, trait, and skill must be accurately pinned down for the distinction between classes and classless to have any substance. Basically an autistic version of "you guys just keep talking past one another, this thread is going nowhere".