Some Female Longhair swimmer keyframes...
You can always skope the female_longhair female body on a female_basic mesh that is compatible with the female_basic swimmer keyframes, so it could all work together.
Some people might. Me, I'm still around 60% successful on any of my scopes, and what you suggest is a bit beyond my present capabilities. I could just use Female Basic swimmer KF, but I've found that the pony tail often cuts thorugh the figure and sticks out in the most innapropirate places.
Email it to me and I'll take a look at it, if you'd like.