When this happened to me, to save the film, I attached the ruined pull tab to the triangular shaped paper attached to the print paper with black tape. Then I fed that pull tab through the rollers, closed the 405 back, and pulled the film through. I did this because without the longer, thinner paper pull tab, that triangular paper that has the goop in it thats attached to the print paper just isnt long enough to feed through the rollers. It does something odd with the threading. I couldnt see any of this of course, but could just feel that it wouldnt pull through right. Plus, it just wouldnt feed through the rollers right. But with the longer, thinner paper of the pull tab, I was able to feed it through the rollers and even close the case and that worked very well.
As far as rethreading the pack, Im not sure. I havent ever done that and know from personal experience with dirty rollers that rethreading wasnt possible. I had to just pull out the film that had the pull tabs messed up until I got to the film that wasnt messed up. It did eventually get to the film that was ok, but I think I lost two images getting to it. That was polaroid chocolate and not so dear as the 665 so it didnt hurt as much.
I wish you much luck! And I totally feel your pain.