Editing open-source libraries

I'm currently developing a C++ library to make the lives of my OpenGL game development team easier. I'm using GLM for handling maths.

Assuming I credit the original creators appropriately and leave any license information in the files, is it okay to rename the GLM namespace to match the namespace I'm using in my library? This will make using the library in the end much cleaner, without exposing multiple different libraries/namespaces to the users.

If this isn't legal/ethical, is there anything I can do to add an alias to the namespace and only expose the alias?

Thanks.