I have a question for you though. What happens if your snake gets sick or injured? In such an isolated place, would there be a veterinarian that could properly diagnose and treat a reptile? If not, I would not consider a reptile. Getting one, housing one, and feeding one are easy. Its if they get sick that you have to worry about. I live less than 10 minutes from a herp vet, and there are at least 2-3 more within a 30 minute drive. I have so far only had to take 1 snake to a vet for illness (rescue) but they are there just in case. While you may take great care of your reptile, there is always the IF. Animals get sick.

Other than that, perhaps sit your parents down and have a talk with them about why you want a reptile and give them all the pros to having one (No litterbox to clean, no hairballs in the carpet, you don't have to take it for walks, it doesn't meow or bark, or drink out of the toilet, etc) Perhaps arrange to have a personal freezer for you to keep the feeders in so that your parents don't have to see them when they reach in the freezer.