Is it possible to use C++11 ABI _and_ both cxx11-style and old-style strings?

I have some code which is being built with GCC 5.3.1 without _GLIBCXX_CXX11_ABI set. Now, suppose I want to use both old-style and new-style std::__cxx11::string's in the same bit of code . Is that possible? If so, how?

Note: I don't really have a good reason for doing this. I do have a not-so-good reason, but let's make it a theoretical question please.