The off screen portion can be simple with Spring Ball or two short IBJs.

Entrance condition:

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

Requires:

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