I think you are correct.. Dead ends here. You need to speculate shorting until they are reported. I would love to be wrong though. Shortsqueeze and buyins along with the site of the chart I posted are the best I have found so far. Think or swim USED to have a short interest sort column.. I am sure there are lobbyists trying to do away with short interest data releases all together.
speculate imo.. I will be posting more info on shorts in thefuture in my usual manner.