Jellal has a barrier that can block attacks from Acno. He shields against Misaki's attacks even if he cant move. Misaki doesnt just get to choose how many hours of damage her attacks do. 1 second in blue dimension is 1 hour. The amount of damage her opponent recieves is proportional to the number of seconds she hits with Blue Stream. All her other attacks only last for 1-2 seconds. Blue Stream is blockable with adamantine shield, and Jellal's barriers are better.
Jellal also doesnt need to move his limbs with meteor. He can ram his whole body into Misaki....which is how he fights with meteor sometimes anyways. Erza's sword enchanted with meteor knocked Misaki out.
The one thing Jellal probably cant do is overwrite blue dimension, simply because we dont know what the rules are for overwriting Blue Dimension. Overwriting blue dimension also wasn't why Erza won. It had no effect on the outcome of the battle. It was just an MP flex. To actually win this fight Jellal just needs something that hits as hard as meteor enchanted amadura sword, and defense as good as adamantine shield, and a way to use magic to move. He has all 3.