This is a fascinating idea. Have StableDiffusion generate an image from the image you'd like to "compress" + a random seed. Feed that output to an adversarial network that compares source image to output and scores it. Try again with new seed.

After running for a while, the adversarial network outputs a seed, and you now have a few characters representing a reasonable approximation of your image.

In 80s there was a man (forgot his name) who claimed that one day you could store an entire high res movie on a floppy disc. One day he might be right when AI can regenerate sequences of seeds to images/video. You just need a petabyte of models stored somewhere.