Best way to always run ansible inside a virtualenv on remote machines?

Is there a better way to run ansible inside a virtualenv on the remote machines?

So far the way I can see is to modify the .bashrc file, manually or with ansible itself.

For example:

 tasks:
    - name: "Enable virtualenv in .bashrc"
      lineinfile: dest=.bashrc
                  line="source {{ PROJECT_HOME }}/venv/bin/activate"

    #
    # Put tasks that rely on this precondition here (?)
    #

    # Optionally, disable this later on
    - name: "Disable virtualenv in .bashrc"
      lineinfile: dest=.bashrc
                  line="source {{ PROJECT_HOME }}/venv/bin/activate"
                  state=absent

TODO: Check if the ways it could be done using ssh authorized keys: http://binblog.info/2008/10/20/openssh-going-flexible-with-forced-commands/