Charging iPad 3 while using external USB Device?

HI all,

I'm starting to use Garageband on my iPad 3 for organ sounds on gigs. I'm using my Korg keyboard's USB port to connect into the iPad (via Apple's camera adaptor).

I would like to be able to charge the iPad (using the Apple iPad charger) while I'm playing (and controlling ) Garageband from the Korg.

Is there a way to neatly do this? I thought about getting a USB hub but the charger has the iPad connector on the end, not another USB connector.

Akai will be coming out with the Synthstation 49 which has a dock for the iPad and charges it while playing but I wanted to see if there is a way to do it without that unit.

Thanks!
John