the typhoon is what every other countries eurofighter could be, if they have spent a few trillion pound of classified research since the 1980s when they setup BAE Systems todo the classified research, so america could'nt steal anymore like they did with the TR-3B during the lockheed martin merger
as far as i know, from documentaries, all the sockets and plugs on a eurofighter are bulk standard molex and PCB connections, nothing special, so everything can easily be upgraded without needing BAE Systems, otherwise the hardware would'nt be classified