External guest posting prompt to register

We have "Enable writing before registering" enabled so a guest user is prompted to register after submitting their first message.

I would like to enable this for a comment box on our site.

I can use the API and submit a comment if a user is logged in, or if I just give guests the post replies permission. But I have not found a way to route the guest post to the register page such that it prompts them to register and then publishes their comment. Is this possible?

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