Is it possible to implement/override an abstract method with reflection?

I have a question about Reflection, but the motivation is from using Spring Framework.

Consider this project, which is a sort of Minimum Working Example version of a deployed project.

In the ProjectionResourceProcessorConfig class, I have an entityProjectionResourceProcessor method for every projection, and every entity in the database have a few projections. That's about 60 methods.

I don't want to keep this up because of the obvious maintenance disadvantage. I want to use Reflection in order to automatically register one bean for every projection class.

The postProcessBeanDefinitionRegistry method in the ProjectionResourceProcessorConfig class shows that I can get the list of classes I want to use to register one bean for each and shows how to register a bean programatically.

However, because I need to use the ProjectionResourceProcessor class, I need to override the getEntityClass method. I haven't been able to find a way to do that programatically. That's why I've declared the inner class. It shows the programatic bean registration working, but it falls in the same issue as requiring a piece of code for every bean.

Apart from reflection, I tried to use the setMethodOverrides method of the RootBeanDefinition class to override that method, but I couldn't manage to understand how to use that method. Google couldn't find any documentation or usage example (except for a vaguely related Chinese post with copies on several different websites).

I also tried to use the MethodReplacer class but I haven't found how to use it with annotation driven configuration.

I also tried to replace the getEntityClass method by a variable and replace the variable's value by reflection, but apparently when the variable is read the value that was set in the super class is the one that is retrieved.

To test the project, run the tests at DemoApplicationTests. It will print the projection of some entities. If they have links, it's working.

Is it possible to do what I want? If it is, how?

Thanks in advance.