My other thought would be to ignore errata and restriction completely and let the players play with the cards as printed for a set amount of time, say two to three months, in order to get a feel for the competitive environment.
Yes,
KoI is a beast to face, but having
ARV (the original) at your disposal can serve as an effective counter-measure.
Maybe an idea like this is a bit too extreme, but I really want players to be able to play with as many of their cards as possible while avoiding errata at all costs.