In the current EVM, tx.origin is the account from which the transaction originates (logically, the account “doing the thing”) as well as the account that pays the gas to execute the tx. They are synonymous.
With EIP-3074, this is no longer the case; these identities get split up: The logical originating account account “doing the thing” is the AUTH’d account, but the account paying the gas to initiate the transaction is the account making the AUTHCALL to remote control the AUTH’d account into “doing the thing”.
I think (correct me if I’m wrong), your implementation leaves tx.origin as the account paying the gas where I believe tx.origin should be the AUTH’d account performing, in spirit, the action.
I’m not sure if this is the proper venue to discuss, but what are your (and others’) thoughts on which account should be tx.origin… the account paying the gas or the account logically originating the action/“doing the thing”?
Edit: Way out of my depth, but what about a new “tx.gaspayer” identity to distinguish the two?