将类属性添加到提供的Bundle:如何?

Our team is having a bit of a headache while modifying our core model.

Our problem :

We have a bundle, let's name it COREBundle. We load it via composer on every app to get the very basic required to boot our system.

The COREBundle provides a Customer Entity. Each app has some special customer properties that we want to add : how to proceed ? Of course the complexity here is to make everything work with the COREBundle provided.

We are exploring the idea of having some MappedSuperClasses but it means we will need to modify all our entities in ALL our apps, which will be extremely time-consuming.

Help? Thank you!