The desired change is:
Before, we had "Shortsword" as one item with a certain monetary value, and "Short sword of Laanx' Mind" as another item with another certain monetary value and specific buffs for this specific item. Weapons with the same name from different ages of the game could have different values and buffs.
After, we will have two "Shortsword" items with the same monetary base value, but one has the "of Laanx' Mind" attribute with a monetary factor and specific buffs related to this attribute. All weapons with the same attributes will have the same names, values, and buffs. One change to the attribute's factors will change the values of all items with the same attribute.