Working as a Scareactor will definitely not ruin it for you. If anything it will enhance the experience, you'll make new friends who appreciate HHN like you, and you'll be able to go as often as you'd like (on your off days of course).
You wouldn't even need to necessarily take a whole two months off from your DC job. Get the Scareactor role, ask to be an Active Backup. You'd be able to take two weeks off, work the days required and enjoy the event.