You can use Nvidia Freestyle to apply your own custom stickers on top of the game, those stickers can be replaced with anything you like as long as you keep the image size the same as the original files. (or you can create new entries in the config for each of your custom stickers but that's a bit more complicated). I made a few crosshairs that scale well in case you want to use them as well, they look like this:
https://i.imgur.com/9GjsQI0.jpg
It's useful because hipfire im this game is incredibly misrepresented by the default crosshairs, and since some crosshairs on some weapons dont have a centre dot making it hard to aim precisely as you have to "estimate" the centre of the crosshair. I personally use this mostly for the R-99 and the Wingman as they both have very tiny hipfire spreads compared to what the default crosshair represents.
Installation
Drop contents of archive in "C:\Program Files\NVIDIA Corporation\Ansel\ShaderMod"
Crosshairs will be sticker 1-3 ingame.
Crosshair 1 has a slight shadow to it in order to separate it from the background, Crosshair 2 has no shadow, crosshair 3 has no transparency on the small dots next to the centre.
