B120dats is hard and prob more expensive if you can get a good price on bluey bits

THIS IS THE STOCK BLUEY SETUP, the discs operate when braking with the pedal (fluid) and the drums only operate when using the handbrake (cable), its actually a good idea in theory but i guess it was too expensive for mass production and maybe weighed too much if your getting picky about weight

im not sure whether you understood this or not
but you are simply swapping the bluey setup for the 1200 setup its not a combination of the two or anything ive dreamed up in my head!