I've decided to just go with the NTSC SNES covers. There's little to no difference and after thinking about it, if there's more NTSC format cover available and that is the current standard, to make my games look universal I can just use them. My games being universal is my main concern, so I'm happy just to use the NTSC custom covers.
I still want the PAL Turok 2 cover, but I cant do the editing you want, as I just don't have the skill. I'll take a look at the NTSC covers and see if my mind can be changed! LOL. Honestly I just don't like the Red and Green spines.
I'll check the interwebs for the type of template your looking for.