Bec de Corbin have nothing to do with each other.
Barmace: very heavy, lots of blunt damage, knockdown.
bec de corbin: shorter than other polearms, very fast, piercedamage
What do they have in common? Polestun isn't an arguement, as most polearms have it.
Barmace isn't very short, look at the morningstar, it is way shorter.
The only thing that might be considered as a change is giving crushthrough to the barmace and see if it's overpowered then or not.
Seriously, a massive bar of iron, thick as that thing, will probably cursh through most blocks^^