Is that trusting one's friends or are they too unstable to trust?
Trusting an ally with any version of the F-35 is a big thing. The base F-35 is still going to be a very great fighter aircraft.
Even since resolution there's unprecedented restrictions of maintenance in RAF service, requiring some major components returned to BAe in the US when BAe are a British based company.
I'm on my way out but a quick search seems to show Israel as having the least restricted version, which is a surprise: https://www.wired.com/2016/05/israel-can-customize-americas-...
Some discussion of the Blair era issues: https://www.defenseindustrydaily.com/uk-warns-usa-over-itar-...
Just because Israel is allowed to add additional equipment to the F-35 doesn't mean anything in terms of the F-35 itself. Which, as I said, is the same as everyone else's.
There might be national secret-sauce here or there, but the major military contractors are all international. Lots of projects involve R&D spread across multiple nations. Things mostly get dicey when looking at nations that are too unstable to trust (Egypt, Pakistan, etc.), or those that are current rivals (Russia, China).