Nice article.

Maybe one detail: ERC4337 doesn't 'recover lost private keys", it recovers lost accounts. 🙂 The private key is still lost. But later in your text you detail the idea ("restore access to lost wallets") and it's more accurate.

BTW, here is the EtherScan-verified source code and deployment transaction: https://etherscan.io/address/0x0576a174D229E3cFA37253523E645A78A0C91B57#code