Best Way to Keep insulation in Wall

In the MAM walls what is the best way to keep the insulation from eventually workings its way loose and falling out of the stud cavity. Is it OK, for example to nail 1" wide plywood strips at irregular intervals (approx 3 per space) or do you recommend something else. My insulation won't be fully inside the 3-1/2" stud cavity (sticking out approx 1 1/2" because I have to add layers of drywall to mass up the outside leaf (the other side of the drywall is inside my house and I can't start adding to that side). Thanks in Advance

what about wire fencing?