I was testing custom chat macros on MM9FAK and ended up screwing around, mostly with Item2. And eventually I've discovered a long trip above the bottomless floor from the Laser Trident ledge to the Item2 floor is possible to pull off.
Done with vanilla only, no cheats, automap overlay can be useful to guide jumps timing :
-Acquire TornadoBlowWep, Item1 & Item 2 on the map (or enter "give TornadoHoldWep ; give Item1 3 ; give Item2 2" in the console because it's a bother to collect them again if you fail and besides, collecting's not the point)
-Stand on the Laser Trident ledge
-Use your Items 1 to get away from the ledge and jump with Tornado Blow while aiming the closest to the wall further away
-Use Item2 and when you reach the world's limit (shown on automap overlay), jump with Tornado Blow, trying to set yourself so you can see the Item2 floor.


Notice the end of the world on the automap : the item 2 will vanish if it touches it. Use the item's momentum and your TornadoBlow to jump as far as possible.
-Use your last Item2 and then, jump with Tornado Blow to land on the Item 2 floor. Landing on the ledge right before at the barrier is considered success too.