better options than Saudi Arabia, a country that can only offer capital and political/religious baggage.
John, since when those three (US, Brits and Frenchie) think about the second one when dealing with Saudi ? They always think mostly the first one. Even now all the talks agains Saudi in Congress mostly due to MBS dare to say 'no' to White House demand on oil and Russia.
Again all this only 'what if' scenario. We only now so far Saudi ask the Brits to be involve in 6th Gen project, and Japan reluctant to accept it. French so far still stick with German, and potentially only accepting new partner if German bail out. One thing the geopolitical track record so far from US, UK, and French with Saudi, they will accept Saudi if the "bargain" is right.
Just add, of all potential Non Euro nations that being talk has big economic potentials (now and future), also has ambition to develop or involve in Fighter development, whose has potential to involve with any 6th gen project as partner? This in conditions present 6th gen project need new partners:
1. India, very potential. However they are also have ambition to develop their own AMCA project.
2. South Korea, as mention before more likely develop further their own KF-21.
3. Indonesia, less likely. Even now has questionable commitment on KF-21 project. Thus make questionable commitment for any International long-term project.
4. Brazil, possible, but considering now they are more interested working with SAAB for Gripen E/F, questionable will be interested with another long-term fighter project.
5. Turkiye, well this is obvious. As long as Sultan Erdo faction hold the reign, they will go with their own TFX project.
Thus left potential the Gulf Kingdoms, especially Saudi and UAE. They always have baggage, now they want more independent geopolitical standing. Still they're continued being predict to have strong capital and most importantly "will" to invest in expensive defense projects.
That's in the end what matters. Money to invest in expensive projects, if you need to find partners for your expensive projects.