I have once removed a drill chuck, which was held very well by the jacobs taper only. The inside of the drill chuck had a small dimple were the holding screw is usually found. It was prefect to center the a drill bit and then tap for a 10-32 screw . When I drilled for the 10-32 tap size, I paid close attention to feel the void between the chuck and the Jacob taper. Finding the void is important, or else you will be tapping both parts together, or worse drill deep into your jacob taper. The void is there but it is not much. Then tapped the drill chuck with the 10-32 tap. Screwed in a 10-32 SHCS and applied some decent pressure and then hit the chuck on the side with a brass hammer. after a few its on all sides and tightening the screw a little it finally pop off.
You could use the combination of the 10-32 SHCS and your wedges instead of the hammer.