Just a weapon.meta twist i did to use Gofclub Underwater
Now it act as a knife

It was made for Lê Tuấn Khải's Aquaman
https://www.gta5-hub.com/weapons/trident-aquaman-justice-league

*Instalation*
Make a backup and drag he weapon.meta in mods\update\update.rpf\common\data\ai

*Bad*
I had 2 option with what i know so far
one was puting the left hand off
and the other one it make the left fist close like there is no weapon but still in position
Its not so notisable so its your choice :)

*Good*
Now Aquaman use is staff underwater
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If anyone have idea how to inprove you are free
like make the weapon one handed would be nice to correct the close fist
and
if anyone is will to make a script that make you spawn sharks , ignore water (if wanted) and stuff like that would be cool too ahahah