Trying not to be a Negative Nelly here. But that whole sit down and discuss it with the drunk woman idea......that's crazy! You can not be reasonable with unreasonable people. How many of us have tried it with people we love and care about? Yet this is just a woman the poor guy went out with a few times. Hardly enough (IMHO) to support a heart to heart discussion and setting of an expectation bar.
The problem is not the woman is drinking. That is the woman's problem. The problem is the woman's friends are calling the guy. Address the real problem with any number of solutions. Problem solved. Try to help the woman....and then a whole new set of problems arise. Problems many of us are very, very familiar with.
Good luck.