Oh cool, an out of bounds trick was found that only needs Block 1 (to get bubble) and Bubble 1 (to perform the zip at map location 3, 11).
Here's a video timestamped to said out of bounds glitch.
I think I get the steps of how this happens.
A bubble is created near the ceiling at the screen border but not too close to the top.
Zoe jumps on the bubble when the bubble is at a high enough point such that the bubble still goes up but Zoe is able to stand on where she would normally stop the bubble.
At a certain point pressing a direction will cause the game to eject Zoe out of the wall, but does so in a way that she gets screen wrapped to the left side.
Once that's done it's a matter of navigating the out of bounds areas for about 2 minutes which is apparently full of ladders. I might investigate this after finishing up the run I have that doesn't use this glitch. Thanks to Rayquaza911 for messaging me about this glitch.
To clarify on this, it's a screen wrap akin to the one in Zelda 1, that can only be done on the right side of the screen and you can only wrap to the left screen with it. If you happen to land in a wall, you can zip in whatever direction. If there is no room to your left you will be brought out of bounds where every tile is a ladder.
To do the wrap, you use the bubble on the very edge of the screen, you know it's working when the bubble travels through Zoe. It can be done on any screen, you don't need a ceiling, in fact it's easier without ceilings above you.