I’m sorry to read this plugin doesn’t suit your needs.
Is it possible you’re referring to Grimlock Author Avatars Section? This section we developed can be used to exclude some users by using the IDs. Unfortunately, this has to be done manually.
Unfortunately, there is no plugin that we know of that you could install that could allow you to get what you are trying to achieve. This feature requires custom development work. As we told you, we think that this is too specific and require a lot of time. In conclusion, our recommendation is to hire a freelancer to do this job for you.
If you’re on a tight budget, we recommend you to require the services from Envato Studio freelancers (https://studio.envato.com/explore/websites-programming). This web platform gives you access to developers who have already experience with theme customizations, and for very competitive prices.