FAQ

How do I add shortcuts to specific Hotbar items?

if (Keyboard.current.digit1Key.wasPressedThisFrame)
{
        Hotbar.ActivateSlotRemotely(0);
}

You can activate any specific slot index with the code above, just change the 0 to the slot id you want. You could scale this up to use all of the keyboard digit keys, mapping them to specific indexes.