Modular Room System Similar to Mega Man

Hello! I am creating a 2D UGC game similar to Mario Maker. I would like to develop a system of "rooms" that the camera is confined in until the player cross to the next. I already have developed the system of placing rooms, I just need to know how to confine the camera to them.

I am using the Corgi Engine, so I am unable to use Cinemachine and Cinemachine Confiners. My Confiner is a Composite Collider generated from a Tilemap Collider with a cell size of 16x16, so the player can draw rooms in basically every way they want. (That means things like bounds probably won't work, but what do I know?). How would I create a system like that?