[VX ACE] - THE PROBLEMS OF THE PART-TIME DUAL WIELDER

Here's the deal. I have a four man party in my current project. One is a warrior who can use light swords and two-handed greatswords. The second one is a rogue who can use daggers and light swords. Then there's an offensive mage who can use staves and daggers. The last one ia a heal and support type mage that can use staves and spears. Pretty standard RPG party.

The problem is, daggers are meant to be dual wielded by both the rogue and the mage, and nothing else. No other waepon should be dual wielded.

Two-handed weapons have the Seal Equip feature, which works fine with my warrior and "white mage", preventing them from equipping shields when they have a greatsword or staff equipped. But since the dual wiealders don't have a shield slot, it doesn't work for them.

I tried not tagging the characters as dual wielders and making all daggers give them the dual wield property, but that only solves half the problem. You can't equip anything in your off hand if you equip a staff or a sword, but as soon as you put a dagger in your main hand, you can equip one of the other weapons on the off hand.

Can anyone tell me how this problem can be solved? I imagine it would involve scripting, but I'm still very much a noob when it comes to that, so I'll probably require some explanation.