get a brand new, cheap laptop or machine (even a raspberry pi works) that you randomly pickup at the store (no delivery order). Install debian 13, install electrum, airgap the device, reboot and generate 1-of-2 your wallet keys.

The wipe the device, use any non-debian other linux (or BSD) to generated the 2-of-2 wallet key.

Why would you ever connect it to the internet? Air gap forever. Physically rip out the radio, only load software by CD (ideally not through a USB interface).