Transfer CC Library Ownership

I've dug through the boards and internet and is this still not an available feature or option?

We're in an unique situation where our client team is being transfered over to another compeditor. We have an extensive CC libray built that our team uses for everything. And so far based on past posts I've read it sounds like the export/download method is a just a big mess, doesn't save groupings or retain linked assets between each other? Trying really hard to avoid this as it would take a couple of days or more for us to fix which we don't have to spare.

Is there a way to update the email from one enterprise account to a new one while retaining the original account and all of its built contents?

Or, if i were to create a individual account and invite myself to the CC Libraries, will it keep all the libraries in tact even if all the other accounts invited to the CC Library are purged?