An interesting and distinctive approach.  I liked it.  I'm just not sure
if Akane would so readily go along with Kasumi. Would Nabiki react as
violently as you described?  She would object, but I don't know if she
would move out.  I'd like to think that she would (I like Nabiki).  I
wouldn't suggest changing this little gem, but perhaps a story showing
Akane's mind after she finds out about the Saotomes.  And what about
Nodoka?  She might well swing over to supporting a marriage to Shampoo,
since Ranma could never marry a local woman of good family.  And Kuno and
Kodachi?  Does anyone believe that if the situation were the other way
around that Ranma would care at all? 

                                                                    dml