How do I use categories 3 & 4 without fast weapon switch on?

I have the default keybinds for the weapon categories but I can’t switch to 3 & 4 without fast weapon switch. I don’t like fast weapon switch because then it’s difficult getting to your keys/inventory and stuff. So is there anyway I can use my number 4 for example to quickly switch to my double barrel without having to scroll to it? It works with 1,2,5,6 without fast weapon switch but for 3&4 I have to have fast weapon switch.

Encountered the same problem when my mouse wheel broke, now I binded it to some other key. I don’t have a solution