Lockheed developed a radar that sat behind a sliding door where the aircraft would take "snapshots" instead of leaving the radar on and exposed. The door would quickly slide open and shut, giving away minimal signature while the image was snapped and then sent to the missile.
Single targets would be an easy adjustment for the missile. Picking one out of multiple targets could be adjusted by the program in the missile circuitry after it launched.
It seems the capability possibly existed to some extent on a single aircraft at LM’s Skunk Works. With current tech, the Nighthawk could fire both radar and IR guided missiles without the need for its own radar. Maybe even as a stealthy drone.