I'd probably recommend dual-wielding then, since you've got more options for increasing your DPS that way.
Another option could even be to roll 5 light/2 medium or heavy with a shield and actually focus on Magicka over Stamina - Templar has a few powerful close-range abilities that run off of Magicka like Puncturing Strikes and one of the Solar Flare morphs. Shield is mainly for defense and some of the buffs/debuffs from abilities as all your offense comes from magic.
I'd probably recommend dual-wielding then, since you've got more options for increasing your DPS that way.
Another option could even be to roll 5 light/2 medium or heavy with a shield and actually focus on Magicka over Stamina - Templar has a few powerful close-range abilities that run off of Magicka like Puncturing Strikes and one of the Solar Flare morphs. Shield is mainly for defense and some of the buffs/debuffs from abilities as all your offense comes from magic.