André, Rolf Dieter Baier's film advance procedure is in addition to and complementary to Ron Spillman's film loading procedure.
I probably have one or two Pentacon WLFs around - I'll take a look. I honestly can't remember if they show the whole screen or not (probably not).
I use Kiev 60 WLFs on my Pentacons. They show the whole screen and have a better magnifier. IMO they are a better design than the Pentacon WLF and they are inexpensive. I may have a spare - I'll take a look.