It's probably ok. I was worried that when they broke a metal part could get inside and cause trouble. It seems the only thing it does is loose the detent that holds the switch in place (on or off). There is enough friction in the contacts that I doubt it will move. The switches are not the highest quality, but they do have very well designed contacts. It's a "U" shaped piece of metal that wraps around the terminals, not just pressed against them.
If anything does go wrong in the switch, all that will happen is the unit will shut down, and you will get a MIL (CEL). It will not damage anything. You would just remove the Stage 1 and the car would be back to stock.
In effect, you now have a flush type switch (with better contacts than a true flush switch has).