Vectrix controller uses an optical quadrature sine/cosine encoder, and has differential hall tracks.
Not sure what will happen with hall only being used (even if you made them differential) - it uses the A/B track to determine rotation direction, and later takes over from the hall sensors (makes a timing map).
The LVC on a vectrix controller - old version is 102V, newer versions of the firmware are 120V. Throttle is not direct to controller either, from memory it goes through the BCM (body control module).
In short - its a nightmare to re-use!