I know they made some updates on the Boostbox. But not my place to disclose any info, but im willing to bet that made be why they haven't responded.
But, You can use any good electronic boost controller honestly. Greddy Profec, Turbosmart units, GFB Gforce2, and the list goes on. Boost control is nothing new and any of those solutions have been used for decades.
I'm also working on an actual solenoid solution that will wire direct to the DME and be controlled by it.
But any of the above solutions will work no problem.