I really like this idea. Being able to see when the lev is coming and come back when the lev is due would massively reduce wasted time. It doesn't make people any less vulnerable at the lev station, if anything potential evildoers will also save time by being able to work to the schedule rather. than wait about
Whilst I appreciate waiting for the lev is a realistic thing to have to do it's one of my biggest bugbears with this game. It's still 20 minutes of irl time that could have been better spent doing something else. We play the game for fun, waiting around for the lev is not fun.