C++/Lua for development, but deploying to Unreal/Unity

I'm considering using my existing custom C++/Lua engine for development, but rolling out final builds to Unreal or Unity. I develop mostly on an Android tablet and the U engines can't do that, but I'd like to keep my development workflow. I simply do not have the time to fix the shadow map and develop lighting for my own engine, so I think I might just export all my levels as OBJ's and somehow transpile all my Lua to whatever language the popular engines accept. Also, since Unreal is C++, can I just write an adapter for my Lua code and keep using it as is?