Account Abstraction (aka contracts send & pay for transactions) for chains with EVM support & finality (e.g. PoS)

Diagram and initial prototype: https://youtu.be/xiu2yfYzE68

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Note: I tried to post this as a link: https://www.reddit.com/r/ethereum/comments/ufa6f0/account_abstraction_aka_contracts_send_pay_for/, but the auto moderator rejected it because it is "too short. All text submissions must be at least 100 characters long." (it is a link submission, not text)