I wouldn't worry too much about the saddles not being original. When the bikes were new, a decent saddle (probably a Brooks B17 or Pro) would have been a common upgrade, and seen as an improvement on the factory product, not a dodgy personalisation. It wouldn't put me off - first thing I did with this one was get it a proper seat, same as I did in 1982. The factory seat was like sitting on an axe (for me, at least).
Yes, I don't remember a Lady Corsair (like there was officially a Dawes Galaxy and Lady Galaxy). Unless the OP means another gents' frame, but smaller? Pics of the pair would be very welcome.