possible to change e-brake from under dash center console

I would think the hardware from the F/M/J bodies would bolt in giving you an underdash foot operated brake. Installing a handbrake on the driveline tunnel would be more problematic. The mechanism would need to be reinforced on the underside to keep it from pulling through the floor pan. The operating cable would needed to be routed in such a way to keep them from fouling the driveshaft and the exhaust system as well as minimize rub on the driveline tunnel. Neat idea, though. I'm interested to see what you develop.