Well, the last company selling the Direct Advantage was Digital Art Solutions, but they refused to sell the white ink version because of the patent issues with Kornit. They might be able to help you out if you just want to run it Dual CMYK as they sell the Sawgrass CMYK ink only - no white ink. You could talk to them at the show as they will be there.
I know the two main Sawgrass DTG tech guys are now at other companies and am not sure if anyone there has the ability to support it. Bigger issue is whether they are even making the white ink / pretreatment for that printer. Unfortunately, Sawgrass is not exhibiting at the show so you can ask them. Might try and call their tech support # to see what they have to say.
Good luck,
Mark