From what I understand, the F-2 was worse off than the F-4. The LW cannon are already pretty weak. Imagine a 15mm cannon with the same ammo load (150 rounds) as the F-4. There'd be no end of griping.
The G14 would be ineteresting. Not as "good" as the G10, but a standardizing of all the late-war features into a single version.
However, I'd say that it'd fly a lot like the G10 does. So I'm not sure what appeal it would have.