Rather than an "Adapted Lens Forum" as on mu-43, how about a "Project forum". The results from a modified lens might look different between mu-43, NEX, and Leica- but the mechanical modifications made would be similar. This would be like the "Projects" forum on ziforums.
I would not expect a lot of threads on it, but it would be nice to capture them. I need to hunt for the link for the 30/1.9 to see what the guy did. I've seen the same done for a Wollensak Raptar 51mm f1.5 made into an RF coupled Leica lens using an SLR helical, and a Yashica GSN 45/1.7 made into a mu-43 lens. These were on FLICKR, not easy to find and detailed instructions not given. Enough to see what the person did.