Rich,
I've been successful installing it into a virtualenv, without using virtualenv-wrapper. I create the virtualenv, using -p to select the python of my choice (Python 3), and then pip install from the saved wheel.
My success though is on a platform that would have supported virtualenv-wrapper - CentOS 7 x86_64. If my suggestions do not work for you, then let me know and I'll try to reproduce this.