No, there aren't, and for a simple reason. The PRT doesn't want independent heroes running around. Independents have zero oversight, generally little to no training in how to use their powers appropriately (from both bystander safety and collateral damage perspectives), and don't have the in-depth knowledge of the quasi-political background needed to avoid accidentally setting off a gang war. It's one thing if you're a rogue and want to use your power peacefully, but if you want to punch villains in the face, it's something else entirely. By having to come in and physically pick up the paperwork, the Protectorate gets a chance to chat with you and try to convince you to join them rather than going it alone.