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Unfortunately, simply adding references to icons from the inventory won’t allow us to implement the idea. The game uses UI/HeroScreen3/Single/Icon.(WindowSimple) and substitutes artifact icons based on the Slot_1 and Pic variables. Unfortunately, it’s impossible to define new variables without modifying the executable file. In particular, to implement your idea, it would be necessary to define the required functionality at the level of the adventure map code. I think this is quite feasible for the Heroes V Universe development team if the idea interests them.
Artifact icons are also displayed in UI\MissionObjectives\KingdomOverview\PanelHero, but they are not displayed in tooltips from there either.