:I Would not recommend giving him to a friend. Not all Mojave Rattlesnakes will feed in captivity. If he doesn't feed, then what? I would not recommend re-releasing him.
IMO I would recommend relocating him about 1/4 mile away from your house, of course I have no idea how the terrain looks. And how do you know it is the same snake every year? I bet there are more in the area than you are aware of.