Would it be feasible, to have a Recruit Pool on New Game Start, or upon New Base Activation, of say 3 to 5 Independent Soldiers? They would still have to be purchased with available resources. But the option to do so, would be there, if the player wanted them.
Or … In order to activate a Base, we would have to leave at least 2 Soldiers in it, while things are Repaired and Built.
As the game progresses, the Pool would be added to as is already Featured in Phoenix Point.
Yes this sounds similar to the XCOM games. But they do not violate any Copyrights those games may have on the features.