I am migrating my seam 2 application to Seam 3 in the latest months...
I think it is a big jump to developers.
You can not find much equlient tools and API in Seam 3. Currently the Seam 3 official doc is also in progress, much improvement is needed.
The booking example is good start point of Seam 3.
Unfortunately, I don't believe that's a usecase we've addressed yet.