If i understood correctly. you want to provide a top quality service by someone with a deep experience in the field but at a price affordable to a small/medium sized business. Unfortunately, I think this is not easy to do unless you play on volumes. To hire such people you need to pay them 'a lot', snatch them from other existing opportunities, ask them to provide their knowledge for a return which may not be suitable to them. It seems rather difficult idea to me, personally. However it can be discussed more. Let me know if interested.
P.S: I am new to this platform but old with the skills.