yeah moving to the attachment point to the stock should pose no problems, as you wont likely be carring the gun slung and folded very often.
I usually use the foamy in-ear polugs myself, but I did try some peltors with the divot shape notched out of the lowr part of the earpeice the other day versus some full oval shaped ones and the divot does make a bit of a difference and allows a better (if not perfect) seal to the head whilst shouldring the weapon. I may fork over the $70 to try these out.
YMMV