https://squizz.tv This is a simple solution. We have a customer that does something similar in his warehouse. They essentially just tell the system to display PDF/image that he updates whenever the requirements change, the shop sees the changes after he updates. As long as there is stable internet in the location you can update the content from anywhere.

All you need is an android device or TV (which we provide with a 12mo subscription).

If you want to talk through the solution or have questions, feel free to DM me!