Let Duelists crown with Trusted One instead of Bugbiter
Why duelists shouldn't be able to crown with bugbiter: Besides being a generally terrible and disappointing weapon, duelists train slowly in polearms and almost always go swords, maces, or axes. It doesn't make sense for a polearm to be one of their crowning gifts.
Why duelists should crown with Trusted One: Duelists already have very powerful offensive weapons as possible gifts (executor and kinslayer). Rapier of the needle is good for the high dex/speed builds. Trusted one, in turn, is the best defensive weapon in the game. While other characters might avoid TO due to the low damage output, a duelist could still use it to good effect due to their enhanced damage with high marks, their faster mark gain, and their higher DPS due to faster attacks. Finally, there's something stylish in a master swordsman naming his weapon "trusted one."