Before we moved to Lithuania, we looked into the tick-enceph. vaccines, particularly for our kids. They weren't available in the US, so we checked again when we got there, and basically, weighing the pros and cons, decided against. We now live in Germany, where there's apparently also a problem, but again, haven't bothered with the vaccine, and we live in a very rural, forested area. The advice we got from the doctors in the US and Lithuania was that if you get bitten, and then start to develop symptoms, just to mention it to your doc so they are aware it might be a problem, and can treat you if you seem to be developing the illness.
As you say, you won't be immune til after your visit, so it's a complete waste in your case.