This is such a good find! I was meaning to find something like TIFA that gave allowance for custom objects (thanks to your SDK) however I've come across one issue (Not sure if an error of my setup, or lack of leap motion)
When I import my model and it tracks the OCS/VMC, it remains in T-Pose, doesn't alter the arm angle or position/rotation of the head while my VSeeFace has the arm angle configured to 70 and head can change position/rotation.
I do not have a leap motion so the option to move arms isn't there for me. Is this intended so arms won't move from the T-Pose unless theres a leap motion or other means of tracking arms?