I'm not entirely sure how threads works, but I know it inputs the data into a MySQL database, it shouldn't be too hard to take the IP's from your classic board and mess around with a new registration of Threads and figure where it saves the ip's to and input the data.
I'm more of a MySQL/PHP guy myself but I've been with UBB.Classic for years and can't see myself taking the leap over to threads, but I'd be willing to help you get everything working just to play around on threads for a few hours to see how it's schema works.
Do you have AIM by chance? If so I'm LordMoguai.