My only worry about the commander suggestion is the departure from the all chips in feel of the game. A character that gets special treatment would remove a quality that I think bb has, especially in the early game which is that of mercenaries desperately fighting to make a living and keep each other alive. It’s not all that desperate a fight if there’s a plot armored character in the mix.
If it was a deal where you chose a character in the roster to promote to the level of commander then that would make some sense, considering that the other factions have a clear sort of “leader” character in their roster. I’d argue that those exist for the player currently though, in the form of ‘captains’ with inspire or rally. I’d love the idea if it could be done without making the player’s band seem “special”. If the tactician can die like everybody else, then fantastic.