Not Changing Player Position On Scene Change Additive

The project I am currently working on is a 2d Metroidvania platformer. We are using scene changers with scene additive to load new scene once we reach a certain point of the game. We want the scenes to be loaded additive so they are not all spawned at the start of the game. Problem is we don't want the player to move when a scene is loaded additive. At the moment you have only the choices of spawning at a spawn id, specific position, saved scene position, or a variable. We could mark every single scene changer by a position and go room by room making the position of the spawn point to change, but this won't guarantee small position changes for the player. If a player is jumping while going through a door and we have a set position this will snap the character to a spot making it look glitching. So is there a way to use scene changers and not move the player from where they are.

also is there any scene changers or events that could be used to despawn rooms. We were going to make it where if you get too far from rooms we despawn them to save memory and performance.