An interesting question indeed. I'm sure someone could provide some technical data on it, however, from a !SLOTH perspective. You're name is tied into the block chain as your wallet address so changing it wouldn't be possible. Having some form of display names on different platforms could be an option though. It's probably a rather niche thing to need.
I've seen discussing on people wanting to separate the content they create over different accounts, this normally just leads to them making a new account for different content which is allowed. I guess that's the only way to keep your 'teaching' content separate from you're poopy mcburger face content.
Yes, something like this. I know you can't change your handle. Like you said, it's tied to the blockchain, but If there were some way to link accounts you own to your display name as an option.
If your name was "John Smith" but you have a Distriator account, a business account and a burn account you wanted to tie to your display name.
Display Name: John Smith
Associated Accounts: