I was thinking if it were possible to enhance the games already played, that is, the 1650, 1000, 2950, etc., with some additional components.
First off, what about the option of buying mercenaries? These could be ready-made troops (usually a division of now more than 500 strong), of a random racial type, at a standard 30 Training, 30 Weapon, 30 Armor, etc.
The main advantage would be that hiring a mercenary company to augment a field army, fleet or garrison would be that they do not subtract from pop center loyalty.
They could randomly show up in any capital pc on the map (maybe several in one turn), and if their services not bought, they vanish the next turn.
Of course, the racial types could only be indigenous to the appropriate nations that would sport them in the first place, that is, you wouldn’t have a group of Noldo archers showing up for hire in Barad-Dur, but having woodmen Men-At-Arms showing up in Minas Tirith would be acceptable. Also, neutrals could hire any merc troop as so long as they remain neutral.