Are you linking out to these sites you have to get rid of?
In fact are they even sites or just other pages on your main site? I have maybe misunderstood 
EDIT - I'll go ahead and assume I've just got the wrong end of the stick and it's pages on your site that you need to get rid of.
In that case if you can't redirect them can you change the links to point to different pages or even just remove them?


