I never advise anyone to do or not do something. However I can provide you with resources to help you make an informed decision. A couple of things to consider: if you understand how vaccines work you understand that vaccination doesn't confer immunization. Just because you are exposed to a virus doesn't mean you are infected.
I have read the vaccine vial inserts for the current rabies vaccines and they do not state that the vaccine will protect you from being infected and it is a possibility you can be infected by the vaccine itself-just like all vaccines. I would think long and hard before having this highly toxic potion injected.