Convert a Nuarc FT 40 6K. 6000 watt MH Fliptop Plate maker, will take a 31 x 23 or larger, comes with integrator and is instant start so the bulb only runs when it's exposing. All you have to do is take out the rubber plate making blanket, cut an opening in the flip-top frame and put in a neoprene vacuum blanket with gasket.
6000 watt Metal Halide, ~ 24" from the screen, you'll be as fast as you want, and probably faster than you need. My 3K unit was as fast or faster than the LED times Alan was posting when he posted his testing results.
Regularly go for $500 or less.