Use Temporary Blue to bounce into the Morph Tunnel with temp blue then continue to the bomb block using SpringBall. Just left of center of the pit is a good place to bounce for entering the tunnel. Requires either a tight shortcharge or clearing the power bomb blocks to open up more runway.

Requires:

{
  "obstaclesNotCleared": [
    "B"
  ]
}
{
  "or": [
    {
      "and": [
        "f_DefeatedPhantoon",
        {
          "canShineCharge": {
            "usedTiles": 16,
            "openEnd": 0
          }
        }
      ]
    },
    {
      "and": [
        {
          "obstaclesCleared": [
            "A"
          ]
        },
        {
          "canShineCharge": {
            "usedTiles": 35,
            "openEnd": 1
          }
        },
        {
          "or": [
            "f_DefeatedPhantoon",
            "canSpeedball"
          ]
        }
      ]
    }
  ]
}
"canTemporaryBlue"
"canSpringBallBounce"

Dev note: Killing phantoon only removes requirements for the strat. The runway is a bit longer with Phantoon killed and the Power Bomb blocks broken, but it shouldn't matter at this difficulty. FIXME: This needs the item to be collected or unspawned, at least if using the long runway variant.