You can get alloy rims in that size, but it would hardly be "worth it." Then again, this being the classic and vintage forum, few of us care whether anything is "worth it." Smaller wheels --26 x 1.5 for example-- are readily available and will fit the frame, but even if you can find longer brakes --BMX brakes might fit-- the longer reach would mean more flex. The aluminum rims would increase stopping power, the longer brake arms would decrease stopping power, with a result that ... I ... can't ... predict.