Generating Keys offline

Hi,

My goal is to generate Ethereum Private + Public key fully offline. (caveman style)
Context : i will be doing this in a new device that will never connect to the internet… ever.

Looking forward to hear your ideas 🙂

PS : if you want to answer with one of theses phrases, just don't. i wish i could care about what you think.
– Use Hardware wallet / use mnemonic phrase / use Key file / insert here any other off topic suggestion