If you have a PAL wii, you need to change your wiis video mode to NTSC with homebrew in order to play the US and JP versions of the game. There's a guide for that pinned in the softmodding channel in the discord.
Defeat Majora on the extensions page does basically do that, just turn human and warp to majora, but it does end up being slower than in unrestricted, because human in first cycle (without ace) is only fast on the Japanese version of the game, and I think the moon warp on jp is slower (having to buy bombs, and get to the graveyard, as well as the setup being slower), and the majora fight is slower without fierce deity as well. If a new credits warp setup is found though, that could change (not sure how likely that is atm though).
You can get the ocarina from skull kid as human, although doing that defeats most of the purpose of becoming human in first cycle, and makes it only end up saving a few seconds compared to just doing first cycle normally. Ideally a way to get ocarina through other means (such as GIM) are found, the main hurdle rn being preforming GIM without access to zora or the hookshot (both not possible to get without the ocarina atm, because you can't heal mikau, or shoot the beehive down without bow/deku). Alternatively, being able to put an item on the ocarina slot in the inventory would allow us to learn song of healing, which would give us access to everything we need to gim ocarina.
Also, learning oath without ocarina should be fine, although actually beating any dungeons without having an ocarina (or way to gim it) in the first place would be pretty hard. You could in theory beat stone tower temple, but it would be really slow and require multiple very long hovers (with blast mask probably), so that probably wouldn't be good for much atm (except maybe max% first cycle). Of course getting blast would also be a problem lol.
As for any% unrestricted, it should in theory be possible to credits warp like this, but the current setup actually uses ocarina to initiate the warp, so a new one would have to be made, and I'm unsure if anyone is working on that atm.
So as of right now, the only category using human in first cycle is Defeat Majora, but hopefully more things are found to let it become part of other categories.
Feel free to join the discord btw for more information!
Not sure how it is on youtube, but on twitch you can dispute it and it will just go away.
If you're using the Mupen64Plus core on retroarch, I think that would be allowed.