We're not prioritizing personal accounts at this point, one of the reasons being to limit spammy accounts.
Sorry about the hassle - you sound like a genuine user.
No worries. I've already created the organization; I doubt this will impact many serious users. I look forward to seeing your new Mac support on HN as a top level submission. Since GitHub doesn't give free macOS ARM minutes at all, this should be immediately interesting to anyone running such builds.