Pre alpha screenshots prove that you could wear 2nded weapons with heater on. At least there are a lot of ppl with hand axes and shields. Also, Im not sure if hand axe was even 2handed in this era.
On a side note, executioner axes (battle axes) are not shown on a player character, paperdoll only.
Edit: it seems a lot of things are not support by the original animations (metal shields, plate gloves etc.) Is there a way to fix it???
Edit2: nvm the side note, concentrate all your mental force for a subject issue