For F&&& sake, keep the FAA separate & give them Harrier 2+ while they're available cheap !
The Sea Harrier production line was shut down and dismantled many years ago, as was the St Louis AV8B production line. So the chance of new build is zero.
The USMC and other AV8B/B+ operators need all the airframes they have to last till the JSF arrives.
Where, exactly, is this supply of cheap Harrier 2+ you speak of?