I don't know if it would be legal, but there are these pencil sharpeners that fit on the top of a bottle, which they are designed to do. https://imgur.com/a/Zjbg4Yz This is what they look like. They come with the bottle in some cases, and are specifically made to be like this https://imgur.com/a/ZXJ4HiX I think that they're an extension of https://imgur.com/a/NhT0D7J this sharpener with basically just an extended shavings holder. In my opinion they should be legal.

They are legal, as the "bottle" is considered part of the sharpener.

thats what i figured, right on.