need help/minor coding for the Slender gamemode

I am about to release a map, but it seems Slender doesn’t have the right setup for me.

Right now, I think it goes through the pages numerically (page entity 1, 2, 3 etc.), and if you have a custom model, it can only use one skin. What I need is for the order of the pages to be random, but the page skins to appear in order as you find them, as if telling a story.

I am not a coder at all, and the gamemode developer has said they’re busy. But, is there any way to make this setup work?

Here are the files for the page entities:

Any chance anyone can take a look and tell me what to edit? Or maybe rewrite it a bit for me?

thanks in advance for any reply!