I agonize over this one myself, but I always list the duplicates since I have the citations anyway. We don't know what will happen next when it comes to the world wide web. (Obviously SVAR itself is an institution but we don't know how it will be displayed and offered in the future.)
In the way that Wikitree works, the biographies are not cluttered with all the source text, you just have the number. You only see the full details if you are curious about it and scroll down. It shouldn't be a turn off to have duplicate source locations and links.