I don't think your proposal is practical or beneficial enough to bother implementing, but I would suggest one major modification:
Instead of front-mounted Green lights, use the existing front-mounted Amber turn signals as your front brake light indicators.
Both front indicators will light up bright Amber, which will not be confused with the lower intensity amber when used as front marker lights. One will be lit solidly and the other blinking if both the turn signals and brakes are used simultaneously. This is exactly what is done with the rear Red tail lights on most trailers and older cars. low intensity for night time markers, bright flashing for turn indication, and solid bright for brake indicatikon.
Mimicking the same light functionality on the front of the car in Amber as is currently done in red on the rear of trailers and older cars makes more intuitive sense to a driver than Green lights.
I also think that it would have much higher driver acceptance, since you're not introducing a whole new color to the automotive lighting scheme.
Sorry but I argue amber would be confused. A new concept of a green front brake light cannot be confused with anything else except a go light. which in essence, it is.
flashing amber is already taken as front hazard lights. they take over your turn signals in fact so you are unable to signal when your hazards are on.