Do you need something to do this just once, or are you going to be doing it a lot? Do you need to be able to reposition it easily and often, or do you just need it set up once?
The quick and easy answer is to build something that spans over head and attach a tripod head to it. You could run a 1x6 across two ladders and bolt a tripod head to it in the middle. That's if you have two ladders, try pieces of furniture that are the same size to work as supports.
I use a boom stand for this. The trick with a boom stand is it needs to be really heavy duty, which means it needs to be really heavy. Make sure it has a decent counter weight to minimize shake. A regular tripod with a boom arm won't work. They're not made to hold that much weight off balance. I have a couple of boom arms designed primarily for lights (big, heavy Novotrons) so they support a 35mm with a regular lens just fine. I just switch out the tips for one that holds a small ball head. You will have to do a remote shutter, as you have to let it settle down a good bit after adjusting it to avoid camera shake. It also helps to do this on the ground floor, so if your model is moving around, the floor doesn't shake and send the vibrations into the camera. You could also get a jib or crane, but getting a decent one would be pricey, and I'm not sure a cheap one would be reliable. That might, however, be the best solution if you're going to be doing this often and can afford to throw some money at it. You can use sand bags to hold the boom or crane legs down if they're in danger of lifting.