(a) The MICA missile, for example, can be used on F-16s, but it would requires more than a sofware change to do so. If you want the missile to be effective on beyond visual range (BVR) shots, a special emitter fitted on the firing aircraft would be needed to refresh targeting information before the missile can use its own radar.
(b) Alman is basically saying multiple air force chiefs, including those from Indonesia, Korea, Singapore, Taiwan, UAE & Qatar are idiots for selecting American fighters and weapons. Taiwan, Qartar and UAE in particular, operate French and American fighters.
2. Demonstrating that you can arm American fighters with non-American missiles, the Python series of missiles are widely used in numerous air forces to arm F-15s or F-16s. Even the PLAAF was so impressed with Python-3 performance — in Lebanon war where the missile shot down around 50 Syrian aircraft — the PLAAF even made a licence production version of it (called the PL-8B). It is a smokey missile, with a powerful rocket motor, for its time giving it greater range more than early versions of the AIM-9.