lol, yeah, DJI discontinued I think it was the naza-h? I was wanting to try something like that on a scale ship. I can still find that naza-h system but I hate the term "discontinued".... lol
Doesn't the Align APS System do all that, it's for professional photography type Helicopters etc, I think somebody on the forum is setting one up at the moment.
The only downside I can see is it requires a 3GX not sure if that one of the old ones or a special one.
Make sure its the Neo . I just thought of something. Its possible that the GPS will only work with VControl. I am not positive but its something to look into. I am sure the Neo will record the data, but if you want the telemetry you may need the VControl.
Try looking into jlog. I don't know what systems it works with but they have a dopler gps system that is the most accurate . I know about but I don't know it.