How do I put several functions into multiple namespaces without duplicating this code?

This is a followup to:

How do I put some code into multiple namespaces without duplicating this code?

I need to change the name of a namespace but want to keep backwards compatibility. The above solution suggests that I would have to do what is done there for each and every function:

namespace NewNamespaceName
{
        void print()
        {
                //do work...
        }
        // 50 other functions
}

namespace OldNameSpaceName
{
        using NewNamespaceName::print;
        // 50 other using declarations
}

My question: Is there a simpler way to do this?