oh wow, this looks super promising!! I already love it, really.
Can’t delete categories and I’m not sure where to find “cat ID” (I know you said it’s draft), but I think this could be really precious – specially if there is a “export this in a format that Discourse can swallow up” feature!!
(I played around with it and tried adding a bunch of categories and reordering them… honestly now that I’ve seen this I feel that I won’t be able to live without something like it!)