As promised here is the demo video showing the lionchief remote controlling not only the current generation of LionChief locomotives but also some post-war stuff. https://youtu.be/Ie4wmCQ8vOg
I am also working on hardware to convert postwar locos to LionChief. I have two methods of attack for this problem. One is to regulate the track power via lionchief, and have a helper board to do electro coupler control,lights and sound. And the other is to make a module that does it all on the locomotive side.