I have included the last working version of remastersys on R9. I had to tweak it slightly to make i work, and I have talked directly with the dev for it over the last few years (fragadelic), so its not new to me, and I know he has his reasons for stopping, but it works surprisingly well and is the command line only version. So if you have the desire, it works. If I can continue to tweak it for the versions going forward, I will without the drama and press (you know who I am talking about likely)
When I get some time, I will post some basics on the wiki that shows how to use the command line version.