Without Springball or Gravity, it is possible to overload PLMs with the crumble blocks with bombs. Take the first left above the waterline. Place bombs in the single tile nook on the left.

Entrance condition:

{
  "comeInWithGMode": {
    "mode": "any",
    "morphed": true
  },
  "comesThroughToilet": "any"
}

Requires:

{
  "or": [
    "h_canArtificialMorphSpringBall",
    {
      "and": [
        "h_canArtificialMorphBombThings",
        "Gravity"
      ]
    },
    "h_canArtificialMorphIBJ"
  ]
}