Keyboard simulating Controller Input

Simulate a Controller (Gamepad) action with keyboard input?

If that is possible it will allow me to create my core game with controller and players without a controller can simply use keyboard without me having to set keyboard controls and filling up the game code.

All I would have to do is set up the simulated controls

for example right now lets say I have Left Shoulder Button on the controller set to open my inventory I need to copy that whole code that makes up the inventory system and replace the controls for keyboard.

Now if I can just set up in a separate group to say If "Shift" is held down simulate "Left Shoulder Button" is held down

I apologize if someone asked this already but I could not find it on the forums

just make it an "or" block and have both on the one event

Yea I could but I think with this simple method constructing code would be faster and smaller. If I set the simulated controls before even making a new system or anything I would already be natively working for keyboard.