OK - I did it.

I am on Mastodon, with the handle @fractals@mastodon.social - no change.

BUT

I just reset my micro.blog generated mastodon account, so the old name is deleted and reset to

@microblog@john.philpin.com - which will just be my MicroBlog posts that are at John.Philpin.com automatically syndicated.

I think the change in naming from johnphilpin@john.philpin.com to microblog@john.philpin.com makes things a little clearer.