Issues with PSN account linked to SE account

Back during beta testing for ffxiv, my brother set up a service account for me so that I could play ffxiv on the ps4. It was under his credentials, as well as his own. Fast forward to now, I'm still linked to everything that is his. He plays ffxiv on pc, but still uses his psn account for other games. Therefore if I'm playing ffxiv on his psn, and he wants to sign into the same psn to play another game, itll sign me out and so on.
I have my own psn now. Is there any way that I can unlink the current psn from the SE account, so that I may play on my own psn account, while keeping all my character information? Or possibly transfer my service account to my own psn? I'm willing to pay for the license again for my own, I just want to confirm I can keep my current character status, because I've put a ton of effort and money into it, and nearly every class is at level cap. I'd rather not have to dish out more money just to get straight to Stormblood content with the boosters, as well as lose all my Veteran rewards.

This was all I could find regarding the SEN accounts and unlinking to an correct account - https://support.na.square-enix.com/c...82&la=1&daxx=3

Assistance can only be offered to those experiencing one of the following issues. We are unable provide assistance for any reasons other than the ones listed below.

You mistakenly linked your Sony Entertainment Network account to the wrong Square Enix account.

The service account to which the game was mistakenly registered to will be permanently disabled during this process.

While you can normally have up to eight service accounts on a Square Enix ID, once the service account in question is permanently disabled, you will no longer to be able to use it.

*If you accidentally registered entitlements for both the Windows and PlayStation 3 (or PlayStation®4) versions to the service account in question, we will only remove the entitlements for the PlayStation 3 (or PlayStation®4) version. In this case, the maximum number of service accounts to which entitlements can be added will be unchanged.

Unfortunately we cannot offer refunds for any subscription fees that have already been paid for on the mistakenly registered Square Enix ID. We are also unable to transfer the subscription status from one account to another and you will be required to set up your subscription again once the process is complete.

This service is offered only once per customer. We will be unable to provide assistance for any requests that are submitted after the initial service.

This service can take up to two weeks to process.

We may deny a request depending on the status of the subscription. If your request denied, a response will be sent to the email address you enter on your form.