Can't change post ownership to an email address

Occasionally we need to create a service ticket on behalf of one of our customers. Most of our service and support customers only exist in our Discourse as staged users.

It would be the path of least resistance for one of us to just create the post and then transfer ownership of that topic to the customer in question.

If there’s another way to do that which doesn’t involve trying to create topics via API that I can relay to our support team I’m happy to do it.

I just need to be able to write an internal document with the steps and they can’t include anything like, “SSH into the server and …”