I have 2nd hand pixel 8a with grapheneos and i havent putted sim card in it since i have it, in my country i have to have registered sim card, iam afraid of IMEI be linked with sim card and once i put it in im f**ked, the reason i need to put card is to verify bank which need sim card being in device.
I did some research but became dumb from too much information
(sorry for my english :D)
Edit: also i want to be private because of my feature, idk if i wont live in country where propaganda is normal
Maybe, although a good custom ROM may help you out there. Also, removable batteries are coming which may also suit your need of killing off all connectivity. EU may have mandated it