Adding a PC to my account.

I play on PS4 but have a laptop that is more powerful and wish to play on there as well. I just have a few questions that I am pretty sure one but would like to be 100% before moving forward.

First off, I know I will have to re-do all my hotbars, UI, Macros etc. Apparently there is some way to store these settings going from PC to PS4 but unfortunately as far as I know there is no way to do it vice-versa. Luckily the only combat role I really play is NIN so I will just screenshot settings from there to easily remember them. As for my crafters and gatherers, I probably need to re-do those hotbars anyway to make them identical with each class so I am not always doing different buttons for the same rotation.

First question. I know I will have to register my PC game key to the same account I use for PS4. I have been playing FFXIV for over 5 years, started on PS3 and did the free transfer. I am guessing I will have to register my PC key during startup on the PC and I will just log in using my current account (PS4) credentials but since it has been so long since I created account I can't be completely sure if that's how it works. If it for any reason is different, I need to know.

Second question. I have been debating between the version from SQEX's official site and the Steam Version. I know going forward that any expansions for the PC account will have to be purchased on the same service. I know Steam has automatic plug in play for PS4 controllers. That leads me to lean that way a bit as I don't have to really install any other programs such as DS4 windows. However I really do prefer the official SQEX version. Has anyone here used DS4 windows to play FFXIV and how well does it work? Lastly if I DO go with the Steam version, I just want to be sure I can still register my PC key to my existing account and use the same character on the PC.

Thank you for posting in the Final Fantasy XIV Technical Forums,
Unfortunately, the issue you are describing is something we are not able to assist with in the Technical Support Forum. In order get the proper support, you will need to contact the North American Support Center.

This thread will be moved to ‘Separate Support Required.”