just in case you missed the next version of the runtime will run directx 11 rather than 9 as the default as step in the right direction and asynchronous texture upload for desktop

08/03/2017 - Beta - AIR 27.0.0.95

we just need to get these feature built into away3d however i don’t see this ever happening. if anyone up for it im thinking of forking the engine to bring it up to date as a new engine all together. like what away3d did with papervision3d.

let me know.

I’m just an amateur programmer and I can’t help you with such a complex thing, but I was interested in your project. The fact that adobe gave up with flash (but not with Air) might be a good thing : Adobe seems still motivated to provide a good solution for cross-platform development.

Too bad nobody answered you, I hope you will find some good teammates and make away3D rise again XD

the complete guide for directx 11 is available here