Hey fooseball, I have a friend that makes and , I think he still sells nose gear brakes. I have flown one of his planes with them and they work really well. It is coupled to the down elevator so that as soon as you land, you just touch down on the elevator, and errrrch, you'er stopped. He doesn't use drum brakes and his whole system weighs verry verry little. I'm not sure on this, but I think its about 1 oz. If you are interested, then I could probably give him a call to get the details about cost and stuff and see if he is willing to ship it to you.
But like others have said, brakes on a trainer are not at all neccessary. With a trainer, just hold out your flair until that plane is flying so slow and so low, that it just drops down on the runway. This way there is not so much foreward momentum and it won't roll much. Also make sure your planes idle speed is set low enough.

LT-40