I'm sorry for leaving it in a relatively uncertain state so long, but I'm officially archiving it now until I can find the time to make & maintain an actually good solution.
Procrastination is a bad thing - Me, after not working on features I should be working on and instead making an entirely new project.
Immersive Portals and Create don't play well together. \ "Vanilla" Create is unable to link tracks across Immersive Portals, \ and the rendering of contraptions across portals is buggy. \ This project is an attempt to alleviate some of these concerns.
To those that like their mods finely polished and entirely without bugs from the outset, \ I recommend waiting for an official solution, because this was written within as little time as humanly possible, and thus is liable to break.