Personally, I think that anything a Quarian could do to get exiled [i]should[/i] be an integral part of their character. Exile is the [i]single worst[/i] thing that can happen to a Quarian in their society, and is only done for the most horrific of transgressions against the entire Migrant Fleet. You can still run the idea past me if you like of course, but if you have any other ideas then they are probably better in terms of a method to have a Quarian off the fleet.