Integrating indigenously developed missiles into imported fighter aircraft

Would letting Lockheed Martin or Boeing integrate an indigenously developed weapon into F-16 or F/A-18 would always leak the weapon’s sensitive information to the Americans?

This is one of (absurd) arguments for developing an indigenous fighter aircraft into which indigenous weapons would be integrated.

Here are some questions:

Who did IRIS-T integration work on the Norwegian F-16s? Was there any “leak” of the IRIS-T’s sensitive information to the Americans?

How about the ASRAAM on the Australian F/A-18s, the AMRAAM on the Eurofighter Typhoon and the Swedish Gripen?

Cheers,
Sunho