After getting the #Mastodon account migrated, I went through all my UIs and switched over finally, including 3 webapps & 4 native #iOS apps. That was mostly smooth. The only failure is #Elk (https://elk.zone), which I think only exposes settings through the user profile page, which I can't reach because it's logged in with a disabled account. But these were all fine:
- #Semaphore (https://semaphore.social)
- #Phanpy (https://phanpy.social)
- #Mammoth
- #Metatext
- #Trunks
- Mastodon for iOS
Except for that last one, the official native mobile app, and Elk, all support multiple accounts. You can switch between instances in the settings. So I just added the new instance and then logged out of the old one. In the case of Mastodon for iOS, you just log out and then in with a new account. Lots of quality time with Google Auth too. Lol