I've got too much love for this game.
Regarding the Fairy Feet glitch, I've tried to achieve as much as I could yesterday evening, on Switch NES app (so US version of the game).
I've done that for about 2 hours and a half, and got it like... 20 times maybe?
I recorded the first ones but didn't actually count each one when I started being - slightly - more constant.
My goal was mainly to see how much viable this could be in real time, and I have to admit it's so hard and precise that I don't think it's viable outside of TAS.
Unless we can maybe find a setup to ensure we reach the right sub-pixel?
Here's one of the recordings:
https://twitter.com/Link_enfant/status/1238238762968027136?s=20
I haven't uploaded other ones yet, but feel free to let me know if that can be useful as a reference to anyone.
I always switched sides to try the glitch both from the right and left of that forced encounter, so I have various recordings of both; sometimes with slashes to help stop my momentum, sometimes by just moving and no slashes.
Sadly I don't have proper recording stuff so I'm currently stuck with Switch's internal feature which only produce 30fps video clips but well.