Is there a way to define the name of generated C++ classes when using Simulink Coder with an slrealtime target?

When I generate C++ code for a model normally (lets called it "testcoder") - the generated C++ classes and files are named using the model name, e.g. 'testcoder.h', 'testcoder_M' etc. Is there a way to override this? For context, I want to write a C++ wrapper that can be applied to arbitrary slrealtime models with a small MATLAB script, but currently the C++ will break as there are references to hardcoded file names (e.g. #include "testcoder.h" and accessing the MMI of the main model class - testcoder_M).