Add/mix the three items described above to hot bar keys (2,3,4,5 were what I used mainly when testing)
Step 1: Crouch (Doesn't work standing)
Step 2: Without rotating your character left or right or moving forward/backward, equip the item using the hotkey
Step 3: Attempt to remove item (via inventory, other hotkeys), again emphasis on not allowing your character to rotate or move.
At this point you should see you are unable to remove or swap the item, as I did.
Obviously to resolve is to turn, left or right, move forward or backward and swapping continues as normal