Roll The Event Die when players make/fail stealth actions. If it comes up 1, have something bad happen. Guards in another room gain some degree of awareness as per Observer State.
To make this a Push Your Luck mechanic make bad stuff happen on numbers less than or equal to “the meter”. (have “the meter” start at 1 and go up one every time bad stuff happens.
This is an implementation of the Cascading Problems idea.