@email@example.com on Mastodon. she/her
For the record, a cookie is kept on each machine that keeps a count of times you visit git.sr.ht and hg.sr.ht, and whichever one has more visits is displayed on the navbar.
~ociaw's solution looks like a good one to me. If not that, then at least put it in the navbar. I don't think anyone is going to be particularly confused by hg's presence, since it wouldn't be overriding git.