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I have an alt for my main account. I just link back to my main account from there. I mainly use it when my main instance goes down. Likewise, I link my main account to an older account I had originally that I migrated from (all same username). That way, even if my new/alt looks really new, if someone cared enough, they could follow the trail backward to other older accounts.
Downloads one instance’s communities (and some other settings) to a JSON, then you can upload from that JSON to a new instance. I’m not sure there’s anything that quite caters to what you’re looking for yet.