Exterior spare tire carrier

I have a 2014 Chevy Sonic hatchback. It's great, but it's very small. I'm going on a 9 month long "road trip," and there's absolutely no way my spare tires (2 of them) will fit inside anywhere. And the top will be loaded too, so I need to attach it to the back of the car somehow.

I know this is weird, but I want the carrier that's made for jeeps. It's mounted to the bumper, and there's a swing-door style tire carrier. You can swing the tire out away from the back, and it allows you to then open the back if you need to. It's perfect.

Please tell me there's a way I can do that to my sonic! Thank you for reading.