Not aware of anything for your specific needs but have sent you an e-mail with a couple of other links.
You might also contact ASGAP - their website was supposed to have been moved but this link still seems to work

Here is a link that might be useful: asgap

There is a book but it's probably now out of print -- published 1993 -- Wrigley & Fagg, Bottlebrushes Paperbarks and Tea trees: and all other plants in the Leptospermum alliance. Angus & Robertson/HarperCollins Sydney. It was completely comprehensive for both species and cultivars when published and quite lavishly illustrated. There have not been major changes in classification or a large increase in number of cultivars since then.

You should be able to find a used copy by searching with Bookfinder or Amazon.com

Thanks for replying. The book by Wrigley isn't available on any of the worldwide book searches. But I did find a lot of info on ASGAP.