minesweeper.
Anyway, the Younglings were at the temple in Episode 3. Where were the knights and masters? Thety were'nt there. Know where they were? Dying as their troopers turned on them in the battlefields of the Clone wars. Having a youngling out on the battlefield is not the same as having a normal child there. They have more combat training than the normal kid. And when Bail Organa was there, Anikan wasn't there to kill the youngling, and he took out several troopers at close range. (which would be pretty tough because they were the 501st meaning that they were battlehardened and seasoned troops) and no one youngling might not make a huge difference, but two groups of five might. That's not the point here anyway. We're talking special units for Coruscant, because the Empire gets the Royal guard when they have coruscant, and the Republic starts in control of Coruscant so they should get an advantage similar to the empires. I guess you could have a Knight at the head of every bunch leading them so it's not just a group of kids left to rome the battlefield. No masters though because that would make them uber to their cause. They are not supposed to be strong as an indigenous unit either.
If that doesn't convince someone, have a two Knights and a master spawn from the temple. That should be fairly adequate, not terribly uber, and pretty balanced for the attacking units. Still, for the Republic, since the Jedi were there, I don't think they'd be sitting back as scenery while there were people dying outside. That's not their way, and that kind of makes it uncanon.