Bike brakes for people with one hand

In bike polo we use either diy levers where a hole is drilled through a lever and a shelf pin is the inserted through this. In each end of the pin is a hole where you thread a brake cable through. You then use what is called a bmx london mod to hold the barrel adjusters.

Or you can buy these Levers from ebay there are also short pull versions around if you look for them.