That thought occurred to me also, but when I tried it I found that I was still getting the redirector fairly often. When I append /focus to the site designation it never seems to give me redirector links. My most recent experiment was with the search term “Declares”
Declares +site:freerepublic.com/focus
(no redirector links on first page of results)
Declares +site:freerepublic.com -redirected
(plenty of redirector results)