Orbiter is so out of date. Why not rip the physics/formulas/equations physics the doc came up with rip em out and put them in a game engine like unity. The engine has everything you need for modern graphics, multiplayer, collision and its multiplatform for you Linux guys. And you can make it moddable which is why KSP was so successful. Think about it. Rip the kerbals out of ksp replace them with modern astronaut meshes and animations throw in the deltaglider put in the docs physics and what do you have? you have a new bad ass looking orbiter with a active modding community. The old addons on the hanger (or what used to be the hanger) will sit there for orbiter 2016 only. I would stop wasting time or worrying about "backwards compatibility". New orbiter, new addons simple!