Similar to https://www.mugenmonkey.com/darksouls/457209
LongTimeNoSiege came up with the idea to use Great Magic Weapon. Normally, I'd use those stats for some extra endurance, but perhaps it'll come in handy to have three options for buffing.
Giantdad with a PGS and Xanthous Wasitcloth for maximum defense.
Make sure to have an Ascended Pyromancy Flame on you for Power Within.
Final ring slot can be swapped at a whim with this build and you can use Power Within + Hornet or Leo ring instead of Great Magic Weapon for potentially higher damage depending on the circumstances.