Meanwhile capturing fighters by boarding seems odd lorewise... Maybe adding a small chance of recovering a fighter UAC item after winning a battle if at the end of it there are no enemy carriers remaining and, at least, a wing was destroyed. The wing UAC could be then sold for the same price as a 0 CR wing or reactivated to get a new fighter wing; if sold, the item would get replaced by the actual wing in the station's inventory.
Perhaps, just to increase the usage of marines, the player would need to board disabled non boardable (capturable) carriers to recover the UAC. In this case if the enemy fleet had no carriers the player would get the option to board the biggest ship to recover the UAC. Alternatively if the carrier/ship is also boardable (capturable) the player could also get a working UAC for success. Or even varying degrees of success in that case, carrier reactivated, working uac recovered, or both.
On a sidenote, I'm proposing an item due to the logistic impact of adding a fully working wing instantaneously to a fleet.