CLI: Generate a new private key, unrelated to any existing wallet I have a wallet on an offline computer, which has too many backups on connected computers. 

I would like to generate a totally new bitcoin address on the offline computer, and use it as a cold storage address. I will then sign an offline transaction from the wallet to that new address and be safe.

How can I create a new Bitcoin private key from the Bitcoin CLI, without using any existing wallet keys / addresses?

I've looked into getnewaddress, but it seems to be getting the keys from the keypool on the existing wallet.

Note - I know I can use bitaddress.org offline, but I would like to use the basic bitcoin-core tools for this one.
Maybe do:

1.) Move to current wallet.dat to a different location (will result in creating a fresh wallet)

2.) Start bitcoind/qt with -keypool=1 (if you want to avoid keypools)

3.) Call getnewaddress

You might also consider using a hardware wallet.