It seems that EIP-3074 could solve many of the problems that come from Warpcast registering FIDs with a new EOA. It could also change/simplify some of the protocol workflows, like signer approval/removal. 

Has anyone posted any thoughts on this?

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I was not thinking of registration at all :-)
But performing onchain actions using your WC EOA will be possible, especially if WC used warps to sponsor transactions, could be an unlock.

How are you picturing it helping with FID registration?

Something like a "signerFactory" contract who's sole purpose is managing signers for protocols would be a handy thing to delegate to. I could see a very streamlined way to connect through Warpcast or another app.