Personally I would just spend a little extra money and get the griffons, I do not know if the regular royal family brakes will fit on the squires, but I would assume they do. Why do you need to keep it light? It is already 132 underfoot and will not be light no matter what and you will presumably be skiing it inbounds almost all the time if you are getting regular alpine bindings, so weight isn't really an issue. My personal opinion is that squires are pretty cheap and not worth it unless you are less than like 140 pounds or something.
squire weight: 1540 grams
griffon weight: 1900 grams
difference= 360 grams = .8 lbs
Are you really gunna notice the weight difference? Probably not, but you will notice the difference if one of the squires breaks...just my opinion, do whatever you want