I love the puppy class I'm in BUT the pups are all pretty much the same age...
Can you see if there are other classes available in your area? Since your pup is only 14 weeks old the main focus of class isn't so much 'formal' obedience as the socialization and beginning focus/training. So you can go to a more 'fun' class to get started.
The class I'm in has 2 of us (with the black GSDs) using the clickers. And the 2 other owners new to dog training and using a word to mark. There have been NO problem with our instructor allowing those of us with clickers to use them. If you aren't allowed to use it then your smart puppy just won't be able to take advantage of learning faster and clearer so adding a bit of confusion.