Both source and destination wallets would be cold. But the automation requirement probably means converting the source wallet to hot, which isn't too much of a problem if the intent is to abandon it after all UTXOs are transferred.
This is a great question.
Wasabi is the hot wallet that has the best privacy. It can be run a continuous coinjoin that lasts for a month at the highest settings. I am not sure if it is possible to load a cold-wallet-created passphrase into Wasabi - but these posts seem to hint at it:
Note that trezor does not have a secure element so would not be the best destination - but you know you're physical security setup.
Wasabi has a really good discord chat.
If you find a working solution, can you post a howto guide here?
I have successfully loaded my wasabi wallet into Electrum but since electrum does not support taproot (segwit v1), I can only see the segwit v0 funds.
With electrum you can have two different wallets loaded at once, so you could semi automate this.
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