It should be really easy to create a 9x9 Fusekle fork. The only non-trivial thing is compiling a list of solutions. Then, it’s just a matter of putting those into a puzzles.js file, adding a “size=9” tag to the div with id=“input-board” in index.html, and disabling the board zoom (setting default zoom to full, and removing the buttons).
However, incorporating some sort of AI-based scoring would require a lot more work.