You're better off getting a preowned Pixel to flash with a secure ROM in this scenario. Getting an iPhone won't help if you if later down the line Apple decides to push an OTA update that forces the same functionality. A Pixel won't protect you from every vulnerability, but it goes much further towards stopping these sorts of attacks than the iPhone does.

Now hey, I won't suggest that Apple would stoop as low as Samsung has here. But discerning customers might not want Tim Apple's phone if he's been cozying up to a crusty politician that can remember to stay for dinner but can't recall his name.