They have plenty of opportunities since Israel is an operator and in close proximity. Although I agree that these two systems in hands of one military are somehow compromising and more so for airplane.
We don’t really know how the Israelis are using their F-35’s. During their initial baptism they were flying along the Syrian border with their radar reflectors mounted. That said, they did reportedly use them on at least one strike inside Syrian territory. There’s also a rumor that they’ve flown reconaissance over Iranian territory. They wouldn’t have done either unless they were stealthy.