I cannot assist with your original request, but I do know of a PDF Reader that works great now with our berries, been using it since their beta. RepliGo Reader for BlackBerry - (PDF Reader)
It's at least worth checking out the trial to see if it renders your converted drawings fast enough to be of use to you.
I use this app to read large technical document pdf files, which include text and graphics, the time to render a page is quite sufficient for me. The latest version imroved on that even more. Now I don't have to lug around my laptop or printed versions to keep up with my reading anymore. Lifesaver, actually.