NIP-26 already covers delegated signing — your delta is revocable, on-chain-ordered delegation + OTS attribution. Say that; it's the strongest case for a new NIP. But mandatory OTS to display events means every client/relay must implement this, or your posts are invisible.
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I had dabbled with making something similar to ColdIron as an airgapped place to create Nostr identities and sign key delegation and revocation transactions.
I didn't go about it as thoroughly as you seem to have done. I basically started with Tails OS, asked an AI to strip out network functionality, and added the Inkan Management Utility, resulting in this:
I wonder whether the Management Utility would run inside ColdIron. I may take a closer look.

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