Norik’s is not pointed by any stretch of the imagination. Again, the part was designed to be an AXE. And Iruini’s weapon has more in common with a glaive than a proper spear. Meso’s already given his verdict: any polearm will do as long as it’s built similarly to Norik and Iruini’s “spears.” I specifically asked him, and he said this:
We make no restrictions on spear-tip usage. Plenty of things in BIONICLE have gone by names other than what they actually are. Norik’s spear tip, for instance, is an aqua- axe. As such, I say go open season with that.
For some reason, it’s not letting me quote the post itself, so here’s a link to his post. I invite you to see the context, since I give some examples Meso signed off on.
Flails usually aren’t polearms, but you could make one that is. I think including the chain would stretch it, but a mace would work fine.