fUze similar to an Arduino which can do 5v USB - but fUze is considerably larger chip and overclocked. .
You'd probably need some kind of DC step up on the fUze system... adding cost.
Technically, the Mintyboost v3 could be made to run 12V (see the 1302 datasheet... you'd need to replace resistors). I wouldn't go down this path though as you'd still need a 9v regulator, and common sense dictates you would remove the USB connector (such as a DC plug) so it's not accidentally used with a USB device.
The best hacks are the easiest... get a 9V rechargeable, or a battery holder for 6 AA batteries