Well, obviously its best to follow the program. But if it were me, I'd run through my regular squat and pressing movement VD, and then start working up to a deadlift 1rm. It wont be a true 1rm due to the preceding lifts, but it will give you a ballpark number. Then next week start back again at the previous weeks workset weight. I wouldn't do it more than every 4-6 months.
Just my 2 cents.