First of all, after the hard intentional foul, you should have already been in there. There's no need to go report anything until you're certain that it's safe to leave the players. To me that's not until the fouled player has gotten up and it's obvious that nothing further is going to take place.
For HS: You shoot in the order the fouls occurred. So yes, remove A1 for his fifth foul, his substitute shoots two shots with the lane cleared. Then any member of B shoots the T shots with the lane cleared. Then B's throw-in at half court. Substitutes may legally enter with A6 or after any foul shot.
For NCAA: You'll have to wait for one of the NCAA rules gurus
