So that leaves as my last (I think) instance migration task, figuring out how to archive my ~450 toots from the old account.
After a few minutes searching, it looks to me like 'toot export' is all bundled up under 'account migration' in this high-priority issue on GitHub: https://github.com/tootsuite/mastodon/issues/177
Viewing the user's page https://mastodon.cloud/@metagrrrl only shows a small number of toots and if you click "Show more" it hides what you were looking at before to show the next chunk. So, no saving that page.
Everyone is welcome as long as you follow our code of conduct! Thank you. Mastodon.cloud is maintained by Sujitech, LLC.