Augmented Reality for UE4

Hey there, I’ve been working on getting this plugin to work on top of Apple ARkit, but I’m hitting a block with conflicting spaces.
At the simplest ‘just get it working’ level I want to find the location of a marker, get the screen space location, and cast an ARkit hit test from that screen location, assuming that the result will be correct as long as the ARKit tracking has had enough time to initialize. From there disable the marker tracking entirely since the object can be held in place through ARkit. Anyone know of a way I could move forward with this? Is it even possible to have this work on top of ARkit in that way?