Advancement idea...

As I understand it, and I may be wrong, but Princeps at one time were hastaii and taraii were princeps... (pardon my spelling). Would it be possible to make a script that watched for a hastaii to gain 3 chevrons then convert them to princeps?

Or have it if I retrain a group of hastaii that had 3 chevrons, have them be disbanded and a group of princeps formed at no cost? Seems like an insteresting idea to me.

I'm afraid that's not possible with the options available to us. There's no conditional to note the level of experience of a unit.