Help with loading assets between areas

[kind turret]

Wondering if there is a way to make this custom transition into altus from liurnia much smoother. Is there a region i can apply to make altus assets load while the player is rising up in the spirit spring? Usually i would do something like this by stepping on an asset to enable the draw group but that isn't an option in this instance.

[fickle hawk]

Usually you'd want to use a collision that the player passes through on the way up.

Typically how it's done with elevators.