There were plans along the way for a Harrier III, which could have been fly-by-wire (instead of fly-by-bicycle-chain?). However, at that point you'd probably have wanted to start over.
The much-maligned Boeing X-32 was more Harrier-like in terms of moving parts than the LM design (dubbed "Chitty Chitty Bang Bang" by a designer friend, very early in the game) but could just not generate the necessary performance needed for a stealth design.