Actually, the AGX are not what you would normally call multiple adjustable. They have one adjustment that does adjust jounce and rebound together, but it almost totally changes rebound.
There is no true off-the-shelf double adjustable made. You would either have to find a damper from another application that would work, or get some custom made. The Koni 8611 double adjustable race damper could be made to work in the rear pretty easily and I'm sure one of their race dampers would work up front. You'd just have to do some homework.