It can be done with a bookmarklet. Make a new bookmark (to some random page if you can't create an empty one) and then change the location of that bookmark to this code:

javascript:url=window.location.href.replace(/collections\/.*?\//,'');window.location=url;

Now when your're on a work page, you can click that bookmark and it will reload the work without the collection part.

(Dreamwidth doesn't let me post a direct link to the bookmarklet, sorry. If you have a problem creating the bookmark, let me know.)