I just killed half the problem. It seems like** I can confirm that the problem is not the Editor Module** itself, because I just got two properly implemented nodes to work and show up in the blueprint graph editor. I got them from Rama’s pull request as he suggested when I asked him here. I will now update my posts to reflect my current findings, which could aid anybody who finds himself in the same boat.
However, I now have another question: is there any kind of feedback aside from the node not showing up to find implementation mistakes in your custom K2 Node? As always, any help would be very appreciated.
**UPDATE: Problem solved! See the solution at the top of the original post! **