@thomasfuchs why portable? I just have 3 separate Mastodon accounts on 3 separate servers for 3 purposes/communities. Works fine, easy to switch between them.
Notices by Jaanus Kase (jaanus@mastodon.justtact.com)
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Jaanus Kase (jaanus@mastodon.justtact.com)'s status on Wednesday, 26-Apr-2023 12:50:48 JST Jaanus Kase -
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Jaanus Kase (jaanus@mastodon.justtact.com)'s status on Saturday, 28-Jan-2023 23:10:21 JST Jaanus Kase @dlx @Gargron sounds like trouble. All Mastodon following across servers is keyed by the handle which is probably case sensitive. So unlikely to work by just a simple local rename.
Account rename through migration works quite well on Mastodon though. You could try making a new account with the desired name and migrate to that.