I've gotten every 'hard to get' FP the night before or morning of my visit.
As others have pointed out, AK has been opening early for months. So, whether its an EMH day or not, be thru security about an hour before the scheduled start time & move with the masses to be off the ride at about opening time (regular or EMH time). You're just trading your wait time to before actual opening time. This is better if its EMH because the first hour will not have FP users cutting in front of you. Beware they load the line out on the sidewalk to deter you from staying, it will look daunting. But, its still the shortest wait of the day, so stay put.
I've even gotten FOP FP while in line for FOP before scheduled opening time. So, I rode twice. I've actually even gotten a 4th FP for FOP & ridden 3 times in one day & I always leave by 2 pm or earlier.