Well, not yet. I am still working myself through all the sef related files. I found something else though:
RewriteCond %{HTTP_HOST} ^www.aaa.com/bbb/$ [NC]
RewriteRule ^(.*)$ http://www.bbb.com/$1 [R=301,L]
Depending on the redirection settings this might help, it doesn't in my case though, I always get an error saying the websites are crosslinking themselves (indefinite loop).
So, I'm working on it and I will post any results here.
Greetings, Paul