..........what I ended up doing is draw a 35mm square in the existing focus screen with a fine nib red permanent marker.......warmed it up with my old ladies hair dryer and "Bobs your Uncle" it works perfect.
If after my india trip I decide to go out and buy a Hasselblad CFV-50c for myself then it will come with the correct screen, if not then I will just get some heli-fuel or the likes and remove the red pen marks.
Thanks guys