The wish in the title is pretty much just a visual one - the damage to be gained there is fairly insignificant.
There is such a nice physical FX available to Inquisitor Seal but it is sadly tied to Mythical Korvan Wyrm that blocks both weapon and shield slots and thus ties the effect to more or less strictly one build and one build only. It would be nice if this FX could also be used on other physical Inquisitor builds such as
[22.214.171.124] Siegebreaker Paladin: Celestial Killer, Crucible 170, SR80 (vid) as an example. And there are several other physical Inquisitor builds out there.
Perhaps this mod (100% Fire Damage converted to Physical Damage to Inquisitor Seal) could additionally be added to another item. Mythical Mark of Kalastor looks like a prime candidate both thematically and power wise but having it on some amulet or belt could be fine too.