I think you can do a galette with a hand formed crust. Or you can use most round slim objects as makeshift rolling pins. A pint glass might be the shortest option that would work. (It wouldn't be my first choice if I was kitchen-macguyvering, but I bet it could do.) A mason jar or other, preferably smooth sided glass jar should work just fine I'd think. A full tallboy (or Monster can) might be just the trick. Any tall slim 16oz canned beverage, so long as the beverage is still in it when you try to use it to roll out your dough. Just some punk rock baking thoughts ;) Did you make a pie? How'd you manage? Share pics.
The pie turned out pretty good! I did roll the crust out with my muddler which worked ok. My crust turned out fine but not memorable, and assuming I try this again I'll probably try another recipe. Being an apple crisp pie, the crumble topping was probably a lot easier than a pastry topping. 
I'm going to make it tomorrow! I poked around my kitchen, and the muddler I bought for making mojitos once might work! I'm going to try.