The Harrier would be highly likely, given the RW US Army interest in it and it's ability to operate "in the field" somewhat like a helicopter. A dedicated Army version might have a bigger, thicker wing, roughly equivalent to an earlier, all-metal AV-8B wing. It would be slower, but the wing would contain the fuel that normally resides in the "welded on" drop tanks you always see on Harriers, thus freeing up more pylonage for bombs and rockets.
A big, fat wing (A7?) might also make a suitable mod for the Jaguar, for similar reasons. The Jag doesn't have to have the RAF's trick nav/attack system: the French ones had much simpler avionics. I wouldn't discount all the avionics though: LRMTS is highly relevent to the CAS mission, enabling the aircraft to work closely with a laser-equipped FAC on the ground.