I'm not certain doing so would be ethical, if possible. If I am understanding the question, that would be circumventing the enterprise licensing for a cheaper model and taking advantage of the product's licensing levels.
I doubt it's your intention to do that (to take advantage), so I think the best advice that I can give would be to contact your SolarWinds sales representative and have a conversation about consolidating the licensing levels you have to better fit your environment. Who knows; you might even save a some money by reaching out to the right folks!
If I've misunderstood, please let me know. I don't want to take this thread down the wrong path.