Shoot the block before starting or in mid-air, then use spring ball to bounce on the crumb blocks and start an IBJ. The shot block respawns quickly so it's pretty unforgiving on the IBJ executions. Conservatively placing bombs for the IBJ will not make it up in time, unless the block is broken while IBJing.

Requires:

{
  "obstaclesCleared": [
    "A"
  ]
}
"h_canJumpIntoIBJ"
"h_canUseSpringBall"
{
  "or": [
    "canTrickyJump",
    "canDoubleBombJump",
    "canBombAboveIBJ",
    {
      "ammo": {
        "type": "PowerBomb",
        "count": 1
      }
    }
  ]
}
{
  "heatFrames": 500
}