If we are lucky we could make an addendum to the current system, however I somehow doubt it would be that easy. The problem lays within how interceptors follow based on speeds. To fix this problem can be simple, when the player starts pumping out interceptors that are faster such as the Dragon, don't have the slower UFOs spawn anymore, or introduce more speedy variants to keep up with player and prevent manipulations of pathing.
Or we could rip up the entire flight system and change, but I think simply using triggers caused by the player, to keep up with the player would be more appropriate and perhaps less time consuming.