These kits really do need a few empty hands. Looking at the Cawdor polearm guys, you can see that the ones that hold theirs in one hand also have a knife in the other. Assuming polearm stats are decent, I don't think I'd want to dilute my guy's polearm attacks with a knife, not to mention pay for a superfluous piece of wargear, but whatcha gonna do with the other hand? Only alternative is to carve the weapon out of the hand to stay WYSIWYG.