Translating it directly wouldn't do much, but a thematic reworking might do it. Something like:
Level 1--Make Cloud Jealous: Wield any size weapon you can lift with no penalty.
Level 2--You Can't Escape: Your weapons gain a reach of 5 feet plus 5 feet per size category above Medium.
Level 3--Impossible Parry: Gain cover or concealment from your weapon in varying degrees based on its size.
Mix well, pepper with bonus feats to taste, serves 1 fighter.