How can I reintegrate an already reintegrated and rolled-back branch in SVN?

Question

We did following ugly thing:

So, how can we achieve another reintegrate?

What did I try so far?

• well, the obvious merge - which fails brutally!
• creating a patch and apply it to trunk (which should work, as it diffs the files with no svn only...)
• creating another branch @ trunk r101 and merge all the changes from first branch - fails brutally :)

edit:

merge-infos for trunk do not show any merged revisions of the desired branch (as I've rolled them back with r101)