There is nothing wrong with the cable operated system. If the 69 one that uses the cables also uses your original dash or the dash you prefer, I’d get that one. I wouldn’t put a lot of faith in what they say will work better when they don’t offer the preferred GEN IV you want in the first place. Looking at the big picture I wouldn’t worry about replacement parts now. Not from “that kit it will probably be replaced in the future for an electronic version and you won't be able to get parts” anyway. I know that sounds short sighted but if there is a problem it will be right away or nearly right away and more than likely it would be the compressor. I would not be happy relocating the controls that’s for sure.