See your first mistake here is to assume that the Japanese will stick around to see this program complete. I see the Americans pulling them out of it sooner or later. There is no way in hell or heaven you are even making a prototype of a mockup in just 10 years. And going by the abysmal track record of the Typhoon program, chastising India for delayed timelines seem like the pot calling the kettle black. Canadians, Aussies and Saudis will contribute nothing technology wise. Canadians will pull out citing cost overruns, and so will Aussies who's military budget largely depends on handouts from America. Saudis will split after Americans make them a good alternative package deal.
Only European next gen bird I see on the road to success is the FCAS.