Thanks Alex , much clearer now.
I think you can get a televue 55mm Plossl having an apparent field of a healthy 50 degree and an exit pupil of 5.5mm with a C8 - guaranteed to get that cone into a +40 year old eye. I wouldn't bother with the `drainpipe' eyepieces seeing as they are not giving any greater true field , although they may make sense if you own an F15 Cassegrain or refractor and you want to get the exit pupil size up . The lack of apparent field with those shouldn't bother such owner anyway as they are probably living in the 1950's anyway if they own kit like that
