If you are concerned on screen recording malware during seed generation and keyloggers during seed recovery, then create an airgapped device. I really don't see how seed phrases are less secure on an Internet connected device. Less comparably to what? A Bitcoin Core wallet file? A malware affected device can compromise Bitcoin Core itself.
Also as the wallet is on airgapped computer, alternative backup like encrypting the seed phrase or the wallet file on a new and yet formated USB stick is also an option.
That is unnecessarily complicated. Just back the seed phrase up in a piece of paper, or if secured for the long term, use
washers. Encrypting the seed phrase just adds an additional private key that you need to be aware of.