A widespread concern is what would happen to Dutch weapon systems if the Americans were to withdraw completely as an ally. For example, Dutch F-35 aircraft are dependent on American software updates. Yet, Tuinman isn’t particularly worried about this.
“The F-35 is truly a shared product. The British make the Rolls-Royce engines, and the Americans simply need them too.” And even if this mutual dependency doesn’t result in software updates, the F-35, in its current state, is still a better aircraft than other types of fighters.
If you still want to upgrade despite everything, I’m going to say something I should never say, but I will anyway: you can jailbreak an F-35 just like an iPhone. (Crack it with your own software, ed.)
Relevant video: https://youtu.be/4X9ww6FtUhE
Tl;dw is that sure, the US could withhold software updates and sure, NL could do their own software thing, but there is a whole intelligence software thing too that makes it harder. And ultimately if the US stops supplying new parts the existing planes are quickly dead in the water anyway. So it’s a short-term solution at best.