Conveniently randomize image via button from folder/slide?

I often spend hours bringing pictures into PowerPoint templates one by one and trying to customize the way a presentation whose behavior is very different.

If there were a way to randomly select an image from all of the images on a different slide or excel file or folder and have them appear based on the probable weight assigned to them, it would be a huge time saver.

I've seen various methods of having a random object appear, and some of them don't even require a macro, but importing the images is always very time consuming. If anyone knows of a better/faster way to link a folder with a group of images or something along these lines to an object that is randomized, please help.

Importantly, showing a random image from a batch group without customizing the way each image is brought in is the hard part. Adding weight helps, but it could be done by duplicating important images repeatedly.