Install an IR LED on the baton. Google "LED throwies" for what you need. Most IR LEDs have a fairly narrow beam so sand down the lens to scatter the light more.
Then get some IR cameras to track them. Any cheap webcam will do. Add an IR filter by having an UNUSED roll of film developed. Install one camera watching from your position, and possibly one to the side, above, or under the conductor if Z-motion is important.
Then get some motion tracking software like this: https://en.wikipedia.org/wiki/FreeTrack
Now you have a signal. Use that to drive any output device you want. Three cell phone vibrators for X, Y and Z might work. Audio might work - try making a tone that changes in pitch with the derivative of the baton's velocity. You should get little chirps when the conductor makes sharp motions. Some blind folks can still sense light - they have basically one pixel per eye. It might be possible to give them glasses with LEDs mounted so they can see flashes.