The Israelis have a solution. Our air chief was given a tour of the F-35I in Israel.
They have a parallel computer network to what the F-35 already uses, this allows the integration of non-American technologies.
Read the second page.
Even the maintenance of the jets will be conducted within Israel.
What it really means is any F-35 purchase will be a political decision, not a technical one. I'm sure the Israelis will have no problem with India being a part of their version.
For the US too, if India's choice is between the Su-57 and an alternative, they are going to want to provide that alternative.
Furthermore, due to extensive Israeli involvement in the IAF's aircraft avionics and overall global network, they can make the F-35I work for us better than any other imported jet.