Thank you for your message.
Unfortunately, as of now, there's no feature to generate an Internet-ID code manually. I will, however, forward your suggestion to our developers for a review.
if the install of the host could re-use the id of the agent, then what would solve my issue.
While this is not possible for now, we already have a similar feature in our wishlist that would allow a user to convert their existing Agent into a Host installation - so that should preserve the same Internet-ID code and other settings as well. We plan to add it in one of our future updates, but there's no specific ETA that we can provide on it right now.
Let us know if you have any questions.