I don't think you're required to change your driver's license when moving. In my case I spend a good number of months in the other state (CA) each year and my driving is done almost exclusively there, so it makes sense to keep the license.

It isn't the frequency of visits that I'm trying to avoid in this case, it's the out of pocket expense. If I could meet once every six months and check in via phone .. or find a sliding-scale service .. that would be great.