Seems likely to me, possibly combined with some sort of planar travel. I'm not sure the policy is all that practicable when the "miscreants" are giants or dragons or the like.
Yeah - one other option is that if the monsters could be contained temporarily until judgement is passed and then sent to a different plane that might be a solution. But ... isn't that just potentially making it someone else's problem or killing them by other means?
What's the current spell for making something smaller? Combine that with a geas to get it started off at least?
Exile/transportation also brings up the plot hook of what happens when something comes back? If they're trying to be enlightened about shipping things off to other dimensions, do they have it set to return them at the end? Does it check if they want to come back? Has their been some destruction at the local judicial center that destroyed the records of who is coming back when? Or what if someone on the other end sends it back early? What if it acts reformed but isn't? What if it is reformed but no one trusts it?