Have you looked into neurofeedback to decrease the sensitivity of the behavioral inhibition system (the direct and indirect and the Hyperfast pathway)? Neurofeedback Beta suppression of the subthalamic nucleus decreases motor inhibition in Parkinson disease, but that is not possible in healthy controls as you need deep brain implants. But beta down or beta suppression over the cortex will probably work the same way. But I am not sure which location the beta should be suppressed. I wil ask my neuropsychologist which whom I am currently doing SMR neurofeedback to reduce blocking.