Somehow I got it working once and have not been able to repeat it, plus it came back quickly. I'm considering this " not possible" because its apparently not a long term solution. Sorry. I tried moving them and screwed up my mailbox and had to make a new one.
It's not unusual to delete default folders and have outlook recreate them, but it usually takes a few weeks, making it somewhat worthwhile to do. This just isn't - even though I'd love to get rid of them.