I can't use FastTravel because I need to go to an external cell. The transition with MoveTo seems too abrubt though. Is there a way to fade out and then fade into your destination?

You could use an IMOD--you'd still have a load-screen, but it might look better.

1) Make a new IMOD, set it to Animated and a Duration of say 6 seconds.

2) Use the Time Bar to move to the first-second, and set colour to black, and the Alpha to 0

3) Use the Time Bar to move to the last-second, and set colour to black, and the Alpha to 0

4) Use the Time Bar to move to the 3/4 second, and set the colour to Black, and the Alpha to 255

5) In use Script something like...

;Trigger Conditions - Whatever you want them to be   MyIMOD.Apply()   Utility.Wait(2.5)   PlayerRef.MoveTo(MyTarget)   Utility.Wait(3.0)   MyIMOD.Remove()

The Wait give it time to fade to black, and then it should move you and let it finish (fading back to normal), before removing the IMOD altogether. My experience is that the timing can be an issue--too long and you feel the length of it, too short and sometimes the IMOD seems to finish before the Wait is properly-completed/the game has reacted to what you're trying to do.

Can you force the player to activate a DOOR form?

EDIT: Actually that might be too intrusive as you would need navmesh for any followers :/ (Unless you can also force any/all followers to also activate the door.......)