I was worried about how slow my theoretical VLM printer would be, especially if I attempt to cut costs by having the screen and light source on a linear axis to get more print volume at the expense of slightly more complexity and more wear on the screen, but I just saw the Mimaki printer at TCT 2 days ago and it takes a while to print a layer, so perhaps the idea isn't solution failing. 

My idea is to use a smaller screen and move it in the direction of its smallest axis to obtain a larger print volume. For example, instead of a £300 13.6" LCD consumable on the M3 Max, a smaller £50 7.6" LCD from the M3 could be used instead and dragged across the area that the 13.6" would have covered and at a higher resolution (3600px vs 4098px, or 46um vs 40um for the 164mm axis of 13.6" and 7.6" respectively. 

[23:08] (Changed the second paragraph to a better screen option than the £100 8.9" screen I originally found. My main concern is that the smaller LCD would be consumed faster and would balance out with the larger LCD in amount of prints completed. For example, going through 3 8.9" screens for every equivalent 13.6" and thus racking up the same £300 consumable bill)