Haha, "The Police Bay" -- that's hilarious!
I realized that there won't be a simple way to make a high-quality version without re-editing the whole thing from scratch -- I initially used 640x272 source files so I built my project using those dimensions, and Premiere doesn't allow the dimensions of a project to be changed -- if I substitute the XviD source with the original DVD files frameserved using AviSynth, I would have to resize it first, which would mean great loss of (especially) vertical resolution, which kinda defeats the purpose of using a HQ source anyway.
So . . . I shall redo it, but perhaps not right away. And hopefully I'll be able to get that d*mn flaming sword right.