I'm definitely late on this but it doesn't seem like the thread really went anywhere. wondering what you ended up doing? if you haven't done anything yet, i will give you my advice.
1- you say you don't want to rattle your car apart.... but you want to run dual DVC 12" subs... that to me sounds like a guy who wants to rattle their car apart... lol
2- you can get great volume and great sound quality out of a properly built smaller enclosure and sub in a vehicle like this. its a small enough interior that you don't need a large box and sub to fill it with sound. a very simple and non permanent solution could be as simple as a Bazooka tube. they are relatively small, do not draw much power, and put out good volume for the price. since they are ported, they bass is not very accurate and not as tight as it could be, so this is better suited to music like rap/r&b/dance/house/electronic type music. if you are into music mainly in the rock/country/pop genres, you would probably appreciate the sound of a sealed enclosure better, and that means you can save even more space.
i ran a single alpine DVC 10" type R in a sealed enclosure in a vehicle with similar interior design/size (kia soul 5 door) and it took up very little room, hit hard, was super accurate, and plenty loud. then i started getting into dubstep and house music, and went with a triple alpine DVC 10" setup ported using the same amp, alpine MRP-500 (500 watt mono block amp) that setup (the triple) was so damn loud in that car that nobody ever wanted to ride with me, including the wife and kids.... but it was space efficient since i built it into the spare tire well, i still had full use of my interior, still didn't draw much power since i was still using the small amp, and had enough boom to notify neighborhoods 7 counties away that i was traveling their direction...
IF you are serious about wanting more sound but don't want to rattle things apart, stay away from the dual 12" DVC setup. you will lose most of your interior, and thats WAAAAAY too much cone surface and power usage for just adding some kick... lol. go with an 8" or a 10", probably just one, based on your original post.