I dont think that will work this way..
First on what you based this offsets? This are not the Airbus 320 offsets but just basic FS offsets.
I think you need to have PMsystems to get your autobrake panel to function but i dont use the logics of PM but from AST and they work fantastic .. see pic below...
But if you use the offsets like you put there it will be more like this..
1, "AUTO/BRK", 642, 0, 0x2F80, I16,,RW ,10,1,1,
2, "AUTO/BRK LOW", 643, 0, 0, BIT, 2, R,10,1,1,
2, "AUTO/BRK MED", 644, 0, 0, BIT, 3, R,10,1,1,
2, "AUTO/BRK MAX", 645, 0, 0, BIT, 5, R,10,1,1,
But this is not a PM or AST offset so it will not show up in your ECAM SD screen.
For the activation of the leds just use the same offsets as you use for the button (switch) and invert them if they go on and off the other way.
pics..
gr.
Frans M