Too many risks, in my opinion, not proactively qting. Once you read about ich, it's life cycle, how each stage works specifically, it's interactions at varying salinity gravities and temperatures, it's something you CAN reliably prevent from ever entering your tank.
While some fish can deal with the annoying stress ich creates, and have a temporary(5-6 month immunity) after being infected, your fish is still stressed from it. At minimum, I don't want my fish to have to deal with that. At most, I don't want any of them to die or have the disease ever enter my tank.
While observation is smart, there could very well be encysted tomonts waiting to fall off as soon as they enter your display.
As long as you watch your copper levels like a hawk, your fish will be fine and most likely enjoy having a full month to themselves eating a lot of food.