Just a really bad idea.
To ask any model to work on a set where you have to be drinking for real will open you up for law suites in my opinion.
I can see models saying, Oh, I would have never have done that if I was not been told to drunk.
Or if something should happen to your models on the set while they are drunk. Well then your just screwed.

Now if you just have them act drunk like they do on all sets that have drinking in the real movies. Then thats just acting and thats OK.