If you are a LE developer, email me at Slake in PM, I will explain in detail how to do this.
I can barely compile a Makefile, so I don't think I qualify.
But there's something else I'd like to ask you:
As I already written, only your Armbian/Libreelec images work on the R-TV S10. Is it possible to apply your "magic" to a foreign .img and cook a bootable image?