Requires:

{
  "or": [
    "canTrivialMidAirMorph",
    "h_useSpringBall",
    "canIBJ",
    {
      "and": [
        "Morph",
        "canCarefulJump"
      ]
    }
  ]
}
{
  "obstaclesCleared": [
    "F"
  ]
}

Dev note: This base strat represents only backtracking after entering from 7. It is possible to avoid a mid-air morph by rolling off the platform above With HiJump, a full jump won't work, so the midair morph may not be very trivial.