I am afraid it is not that simple, unless one has passed a bar already, petitioning to take a bar exam just isn't feasible. They need to go back to school and get the minimum 26 ABA credits for the DC bar or start over. Additionally, the Concord grad was a resident of Mass and that weighed heavily in his favor being from out of state seals one doom usually.
The 26 credits are law school credits in subjects that the bar exam tests. The 26 credits are after getting the non-bar JD. By the time you enter law school, your BA should already be in hand.
Write the Concord graduate who petitioned Massachusetts to take its bar exam. Ask him how he went about petitioning that state's bar exam. I posted the court opinion on this forum around October of last year. Even though it is a different state, the procedure may be similar.