Gilgamesh isn't a magician, first of all. Second, saying Gilgamesh has one so we should have one too is shit logic because Gilgamesh has everything, including things that shouldn't exist because they're unspeakably stupid -- like ancient Babylonian spaceships. Third, we are a long fucking way from being any kind of Elder Solar. And fourth, it's a stupid idea in general.
That we're even having this discussion makes me want to start my own Solar!Issei quest and make you work with just your Exaltation. No magical mentors, no Sacred Gears, no cheat codes and no free stuff, just your charms and your wits.