I'll add my vote to the "why bother" side of the camp. There is just not a need for power brakes in a car as light as the 1200. I personally like the "squeezing a brick" feel of well setup un-boosted brakes. Better feel and control when braking at the limit.

My old rally car had B310 front disks and rear disks off of what was sold as the 200SX in the US. No lack of braking or high pedal pressure here...