Answering your first question I am pretty sure the answer is no. After flight officers became flight lieutenants (in 1968) I dont think there was ever a "W" after the rank, as was still the case with ORs (SACW) etc. This seems logical as in the latter case the abbreviations stood for aircraftwoman etc. The abbreviation "WRAF" did however appear after their names in the RAF lists of the period
I am not sure what happens with ORs now, but one day in Tescos I did ask a female naval rating who was wearing a "killick's" anchor on her sleeve what her rate was called now. In the days of the WRNS she would have been a leading wren, but as she could hardly be called a leading seaman, I wondered what the new terminology was. The very sensible reply was that they are all called "leading hands", whether male or female. Thank goodness they didn't decide on "leading person"!