Tictoc, you've made it clear that you don't want to hear this, but given the expenses and the risks you are going to incur by renting, you should really be asking for quotes from the various drivers who have been recommended to you. Your resources in case of accident or misadventure sound quite limited. Your savings are going to turn out to be modest, if anything. (Have you confirmed that the rentals are "unlimited mileage"?)

Think what you are going to do if your rental vehicle has mechanical problems in Ochi. Yes, you said you need an emergency phone number, but that doesn't mean somebody will be there shortly if you have trouble.

Also, you never answered whether this is just you, or your whole family. Heading off on an adventure by yourself is different than taking your kids along, of course.