Thank you very much, Tom!
I wanted to automate this process, but as I mentioned in the video, it’s all quite time consuming.
What I think would be the easiest solution is some sort of Python script that automatically renames the selected animation asset curves to match the ARKit names. I tried working on this, but I kept running into brick walls, so eventually I gave up on it. 
Anyway, here is the full tutorial, in case you or anyone else is interested, It covers the workflow between Unreal and Blender as well.(and also shows how to get head movement working if anyone wants to set that up.)