Cross the room while killing the Beetoms, then use two precisely positioned Power Bombs to overload PLMs. Place the Power Bombs at the same height as the tile above the door. This ends up being the max height Samus can jump and place it while at the very bottom of the room, with a midair morph or artificially morphed Spring Ball jump.

Entrance condition:

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

Requires:

{
  "itemNotCollectedAtNode": 5
}
"canRiskPermanentLossOfAccess"
"h_artificialMorphMovement"
{
  "or": [
    {
      "and": [
        {
          "ammo": {
            "type": "PowerBomb",
            "count": 3
          }
        },
        {
          "or": [
            "canInsaneJump",
            {
              "ammo": {
                "type": "PowerBomb",
                "count": 1
              }
            }
          ]
        }
      ]
    },
    {
      "and": [
        "Morph",
        {
          "or": [
            "ScrewAttack",
            "Ice",
            {
              "ammo": {
                "type": "Missile",
                "count": 5
              }
            },
            {
              "ammo": {
                "type": "Super",
                "count": 5
              }
            }
          ]
        }
      ]
    }
  ]
}
{
  "ammo": {
    "type": "PowerBomb",
    "count": 2
  }
}
{
  "or": [
    "canWalljump",
    "SpaceJump",
    {
      "and": [
        "HiJump",
        "canSpringBallJumpMidAir"
      ]
    },
    "h_artificialMorphIBJ"
  ]
}

Clears obstacles: A

Dev note: This requires canRiskPermanentLossOfAccess unless Samus returns through the crumble blocks.