Unfortunately there is no way to do this by event for editing the classes equippable weapons/equipment.
There is a different way to do it through the use of common events, but it would be rather long to have one for each character and especially if you have a lot of weapons.
Your best bet would be to go with a script for this one. Probably much less complicated.
If you still want to do it by event, I'll be glad to make the event.
COMPLICATED is my middle name!
~I am formerly known as Hatredlust. My new name Is Ale Goth
Long live the...!