Yeah using AI to do a first stage pass seems to work well. I did something similar with Nano Banana: https://github.com/c-jiph/bitmap-to-gcode

I didn't actually end up playing with it too much but the problem I found was it's a hard to get a one-size-fits-all prompt. The AI generated images are usually okay but some features aren't great for a plotter or just don't look visually pleasing. It's still better than having to manually mess with the initial image.