Must concur with you on this issue of freezer bag omlets with scouts. I have tried that with our troop and the boys have difficulty with keeping the bags away from the sides of the pot. Good luck! I would take along some packets of oatmeal for those whose bags touch the side and dissolve into nothingness in the pot of boiling water.

Something we do is cook an egg in a paper bag. Everyone gets some pieces of bacon, rub the inside of the bag so it is well greased, put the eggs in along with the bacon strips and cook.
Again, take along some oatmeal for those boys that did not sufficiently grease their bag! We only do such things car camping when we have the troop trailer along with all the supplies.