It won't be quick, and due to the nature of the course, anyone who wants to do the other version can bail halfway thru our run, and leg it back to the finish along the Canal which is the shortened route anyway.
A few years ago before I managed the full route, I did the shortened route, and as there was only me and a few others I finished first and when I got back to the finish had to gee them up "hello, anyone about, I've finished" no fanfare for me boo hoo!
Don't think i'll arrange any dripping sandwiches, you'll have to wait till race day for that!