[White_Wolf]

In theory, it would be possible.

In practice(as a bare minimum):

- you need to patch the firmware for the new display

- patch out the radio

- ? patch battery capacity or re-init

Not sure how much of the patching part is possible atm.

[transpute]

Are there separate radios for BT/WiFi (Apple) and LTE modem (Qualcomm)? If so, it might be possible to turn off just the LTE modem by pulling down one pin, while allowing the rest of the phone to function normally without OS/firmware modification.

WiFi can be locked to whitelisted SSIDs via Apple Configurator.