Even if the amendment was amended (heheh), it would still be hard to push a deal through. inasmuchas they are the top 3 interested. As close an ally as Japan is, there is still the sting of a security issue (Aegis technology was compromised a few years ago by Japanese personnel - very embarrassing), F-22 is very expensive for both AUS and Israel (Israel is giving us a hard time about the price of the F-35 alone). Plus I there is still I think strong will in Congress to keep Raptor technology inside US borders.
The actual export of the jet has nothing to do with the Obey Amendment. That Amendment simply stated that the funding provided to the program could not be used to develop an export version of the aircraft. Other things already prohibit the export...such as ITAR's, the munitions export controls, etc...
They could easily approve the export of the aircraft, provided the Government funds (separately) the development of such a version.