There are probably a few different reasons why they may have chosen not to release it yet but we can always hope.

I think there is a free version of SPAD.next , I bought it because I use it with the Saitek radios for ease of compatability with other simulators and software variables.  I also write and have written honeycomb profiles for several other aircraft for P3D / x-plane and Spad has really help speed things along if the simulator doesn't have a way to view variable through FSUIPC. My needs it fits me but for your needs the free version might just be enough to get you what you need.  Good luck to ya out there and here's to hoping for an SDK sometime in the future.