How do I animate the sign texture? (Help me pls)

So I want to make a texture pack that replaces some of the part of the sign textures with the log instead of the planks.
But for the crimson and warped variant, I want to add an animation similar to their respective stem texture.
But for some reason it doesn't work

Vanilla method that didn't work (The way that blocks do it)
I started of with the crimson sign located at "/textures/entity/signs/crimson.png".
I first made that texture into an animation by stacking the same image ontop of eachother.
Then I made the animation file at "/textures/entity/signs/crimson.png.mcmeta" as this is the way block do it but that resulted in a missing texture.

OptiFine method that didn't work
Then I just copied some stuff from another resource pack which animates mobs and adjusted the file names.
The resource pack I'm talking about is Animated Mobs as it involves animating entities.
Here I changed the file at "textures/entity/signs/crimson.png" to not be animated
and removed the animation file at "textures/entity/signs/crimson.png.mcmeta".
Then I moved the animated texture to "optifine/anim/crimson/crimson.png".
And I the animation file is at "optifine/anim/crimson/crimson.properties".
Which resulted in no animation at all but just the still image at "textures/entity/signs/crimson.png".

If you need more info, here are some files:
The first attempt (vanilla) [url=www.mediafire.com/file/3ykwdirpeqr5x4y/Better_Signs_Method_1.zip/file
]www.mediafire.com/file/3ykwdirpeqr5x4y/Better_Signs_Method_1.zip/file
[/url]The second attempt (optifine) [url=www.mediafire.com/file/7r8ucx9z29cve6e/Better_Signs.zip/file
]www.mediafire.com/file/7r8ucx9z29cve6e/Better_Signs.zip/file
[/url]
If you could help me I would greatly appreciate that.