Thanks. I thought that might be the case. I ended up splitting the reservation into 2 & 3 instead of 5 together, so we can pre-order without trying to keep the credits straight for a payback, and only had to push the time back by 5 minutes (8:15 instead of 8:10) to do it.
The whole point of this breakfast is the PPO access to 7DMT, so getting in and out efficiently is top priority. We enjoyed the food well enough last time we were there, so we're not willing to do the cupcake-and-coffee thing I've seen suggested to get in and out quickly, and it seems like being able to pre-order will be important if we want to be done with our meal before 9. Now, fingers crossed that the park doesn't end up opening earlier and EMM isn't scheduled for that day!