irishfan,
the answer is NO: once you are awarded a scholarship, no new schools will be added through the subsequent boards.
if you don't get in to the school you picked and notified to CC by the 30 day deadline, your best outcome is to see whether you can transfer your ND scholarship to a school that accepts you. However, this is NOT guaranteed outcome. I hear that every year, there are scholarship winners who cannot use the scholarship because they did not get into the school they picked for the scholarship, and they couldn't transfer the scholarship to the school that did accept them.
This is why getting a scholarship to an insanely competitive school is both blessing and a risk. Admission outcomes for top 10 schools or so are crap shoots, there is really no way to predict whether one will be accepted or not. So, you could have a scholarship to Harvard, and not get admitted. (by the way, this is even worse since the likes of Harvard and Princeton don't even have ED or EA).
Is it too late to do ED for Nortre Dame? If you can, you will get the results before the 30 day period is over. If you get in, you lock that in. If you don't, then you can choose another school (in the scholarship award form, NOT a new school that was not on the original scholarship offer list).
Also, note that ED boosts your odds significantly. . It's a well known fact. There was a study by somebody that showed that ED application is like getting additional 200 points in SAT. So, if you can do ED to ND, that will be the best.
Just so that you know, my son has submitted RD application to his top choice school before the board decision came out. This is a pretty competitive school (within top 30, sort of). Now he got the scholarship for it. we are going to convert it to ED: even though the ED deadline was Nov 15, the school will allow him to convert his RD application to ED - that is possible in part because S has been telling the PMS and the ROO all along that is his plan, and they have been communicating with the school admissions office well in advance, and the admissions director gave an informal agreement to allow this because he is aware of the situation, and he knows that my son has a sincere desire and was not gaming the system.
So, talk to the PMS of the ND battalion. Find out whether they can advocate your case to the admissions office and let you apply ED even though it's past the deadline.
Good luck.