For sure they should rent a beacon if they are up for skiing the ridge or Schlasmans. We have new policies in place now, we still require a beacon but no longer require a shovel and partner to ski the ridge or the new lift served schlasmans terrain. Personally I still ski with a shovel and partner. They might want to consider a guided tour of the schalasmans terrain, cost is just 140 for three hours (beacons, pack and shovel provided) with each additinal person costing 40. You can get six or more runs (1700 vertical) in easily in three hours and you will finish understanding the basic lay of the land, boudaries, important landmarks and maybe most important of all, where you can get cliffed out. Nothing is marked out in schalasmans or off the ridge.
Like Rio said, there is a lot of very interesting terrain "inbounds" at Bridger that will challenge the best skiers if you don't have beacons. Tell them to have fun and be carefull out there.