We used to live way out in the bush country , we would buy milk in bulk in the nearest tow and freeze it.
I found that it starts to separate after freezing , we would have to mix it very well to make it drinkable again.
The longer it was frozen , the more it would separate , so perhaps if it's not frozen too long , it may be fine.
Let us know how it works out , I would be interested myself , I just turned down 10 gallons of fresh milk two days ago , I just don't have time to make cheese right now , and I was afraid to freeze it , but maybe next time...........?
Cheers and good luck , Jim.