Holy cow, thank you so much! I feel like kicking myself for not checking pcgamingwiki for this game, since I have for many other games. Who knew all it took was dragging dgvoodoo and company into a different folder! I assumed it always had to be in the same folder as the actual game exe, never even considered that there was a different exe that did all the rendering.
You're right about the movies not playing though, I only managed to get the intro movie to play properly using 16bit color mode. The in-game cutscenes between tutorial levels play the audio but just show a black screen. Not the end of the world, they're super short and you can just watch the avi files!
Again, thank you for the response, you've made my whole year!