This is a Shady Knight mod that allows you to swap active and fallback weapon with a key press.
The latest release of the mod can be downloaded and placed in the GameFolder/BepInEx/plugins directory.
To swap weapons you press the swap key (default: Tab) in-game to swap weapons.
Edit the config located at:
GameFolder/BepInEx/config/tipe.shadyknight.swapweapon.cfg