If nothing else, I think it is safe to say there is a market for such an item.
There is a market (just like there's a market for everything, really - it's all about long tail economics), but the quesiton is, can that market support the costs required to produce and market a screen through sales? Money and time, both being finite resources, mean that the effort impact other projects like books as well. Screens are complicated to produce mainly because of the materials required to make them and the art required for them both significantly affect their cost curve. Traditionally, they have also not been very strong sellers in the market. However, game aids seem to be enjoying a bit of a renaissance in the industry nowadays so it might do OK.
Should we do a screen, it will probably come as a ransom model
project, with people committing cash towards the goal, and reaping the reward when the project breaks the necessary amount. That gives us both an indicator of actual interest and the capital necessary to produce and distribute it without adversely affecting other projects.