How about adding a second Primal Focus Quest?

[Garlyle]

Obtain the existing weapon from Primal Focus.
Obtain Key Items from Leviathan/Ramuh/Shiva Extreme.
Trade to Drake for an i115 version of the weapon with added glow effect.

I like this idea. A lot. It simultaneously adds value to the Primal Focus to begin with (which has been more or less lost except for vanity's sake or alt class gearing by now)