I do not agree. The wish of satisfying a larger public by mixing male and female slavery is, IMHO, unproductive. Lot of people who are interested in female submission are annoyed by men in the same situation (I'am one of those) and, probably, the lovers of male submission are equally uninterested in what happens to the female slaves.
So, better keeping the two different trends separate: the switches are a minorance.
Going back to the proposed theme, actually most sadistically oriented males love very much the idea of some sadistic females directing BDSM games at the expenses of female slaves.... so the idea, though not original, is very good.
I must say that also in the actual practice, as far as my experience is concerned, there is nothing more exciting than having a good female mistress helping one or more masters in the submission of a female slave.
And, according to my experience, it is not difficult to find a lady who enjoys sexually and sadistically submitting a female slave.