Had some more time to look hard at this one. I know it’s quite off topic for something in a GP forum but I think I might be on to something. I thought about just generating my own shuffle function with jQery, borrowing a bit of logic from this Stackoverflow post http://stackoverflow.com/questions/1533910/randomize-a-sequence-of-div-elements-with-jquery.
So I made a test JSFiddle https://jsfiddle.net/coolwebs/zLgsdno7/4/
Now I suppose it’s all about integrating it into a GP page template. Is the posts grid structured in a way that would allow me to do this kind of customization Tom?
I will try and look into it more over the next few days.