Well, if we don't want it to do that, we have two major choices, with some little choices below.
One, leave it as 3 choices. Redirect further automatic adventures with choice 2 selected to the safe choice of 1, moxie, interpret based on predicted safe adventuring (where it attacks if it should be safe or moxies if it isn't), or interpret based on class, so that primestat moxie classes get moxie and other get the combat.
Two, change it to 2 choices. The first is moxie/key, the second is combat. The first would do the moxie first time, empty drawer (for key) the second, and go back to moxie following. The second just does combat every time.
Of the two major choices, I prefer the second, as you know exactly what's happening... people who want the key can set it as a goal, get it quickly, and move on. People who want combat know exactly what's going to happen. There's no chance of an unintended failed combat wasting an adventure or the like. The only time when this might be bad is if, for some reason, you don't want to unlock the Ballroom.