It's been tried before, most notably the F-20 Tigershark. However, the feeling among potential customers was if the USAF didn't fly it, why should they?
If a country want's a "value" US built fighter, they have the F-16. If they want a larger aircraft, they have the F/A-18E or the F-15E. If they want cutting edge avionics with a little stealth, they have the F-35.
For non-US "value" aircraft, there's the Saab Gripen or the MiG-29. For something larger, there's the SU-27. For the latest and greatest in avionics, it's the Eurofighter and Rafale.
I’m afraid we’re going to be out of the fighter business in five to ten years.