If you use that fix in multiplayer, everyone else must also be using it or else there will be problems.
There are lots of ways to stop 56 Stonewardens. If you are looking for a way that involves fewer units, then you might have 28 Hunters with Scourge and four Ritualists. If the Stonewardens have taken Magic Resistance + Resist Fire, however, then you'll need a larger force.