I don't know if it's even possible, but it sounds like a stupid category extension and could probably make for some interesting routing

There are levels where you have to produce sun, which is not possible without plants like the Sunflower, Sun-Shroom, or Moonflower. What's possible would be "no sun type plants" but it would just degenerate into moonflower spam every level

We only have a few Any% runs on the leaderboard anyway, so we really can't consider CE's until the community grows.