Though I do worry about private key management.

Password + 2FA is safer than just having a private key you enter into a site.

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I’m pretty sure someone will soon deploy a Ledger-like solution for this. Maybe Yubikey.

Private key should not leave your machine, using it in an extension like a hot wallet is a little better. I've seen there are little ESP32 devices to flash yourself which can be used to sign, will get one and try.