I realized that you can export with year month day structure, which would be close enough to what I need, but I tried with the huge apple photo library and it got stuck at preparing metadata. Now I am doing exports one by one, and I guess I'll finish before a solution is found, but it would be super useful to have a way to deal with these huge libraries. Maybe exporting just the xmp through photo culler and let apple photos do the media? That could also work.