Create shims to wrap virtualenv for use with pyenv.
With pyenv-virtualenv one can not create virtualenvs in any directory.
Once you have one or more Python versions installed, use one of them to run shims.py.
It will download and unpack virtualenv in the current directory.
Lastly it will create small shell scripts in the current directories bin sub directory for each Python x.y version.
Either add that bin directory to you PATH,
or copy the scripts somewhere that is already in your PATH.