Since the new ASPD implementation, betsanc speed penalty significantly reduced betsanc usage. Here are some proposal of items that would cancel such penalty when equipped. To give several options to the players betsanc will stay active when equipping or unequipping the item, only the speed penalty gets canceled or reactivated.
The list only contains weapons and shield so the already powerful upmarmu assassins will not get more power.
1) Wand & Wooden staff
So mages can enjoy more protection while casting spells at their normal speed except upmarmu.
2) Scarab armlet
Here we want to promote collaboration between warriors wearing the armlet and powerful mages. Warriors can swap between "armlet and no speed penalty" and "usual shield for best defense but endure the speed penalty" depending on the situation and without canceling the betsanc spell.
3) Imperial bow & Kid book
Improve survivability of imperial archers and trolls.