Thank you for your suggestion much appreciated, However as mentioned above player heads can already drop if you kill players with an axe the percentages is low of getting a head it also depends on the level of your axe. This is a datapack that is created to act like mod like outputs, and that is something we try to avoid on the server.
I see that this data-pack you suggested also drops different heads, but you can also buy different player heads at Token shop with tokens if you were revering to the different heads this data pack drops.