I get that, but what will he do if another woman comes in. Will he pay 750.00 for each woman not served?
Another possibility:
Make friends with an amiable Muslim, or even one who can act the part.
Have him be on call. Take lunch before the last head when you see Miss Wannamancut in the waiting area.
Then have Mohammad (acting as barber) state in no uncertain terms that he will not touch, much less cut the hair of said woman, and that she is dressed like a whore (regardless of what she is wearing), that the Prophet declares that she should be accompanied by a husband or male relative if she insists on being in public, and that she should leave before she brings further dishonor on herself. If she still insists, have him bring out the clippers with a 3 foot extension rod and see if she stays in the chair to see what he does next.
Alternatively, you can bring in a woman to portray a female Muslim, in hijab at least, have her roundly insult the woman in question in a borderline vulgar manner, speaking Arabic every third sentence, while the swarthy bearded men waiting for a trim stare at her . . . cold and hard.