Run a znc bouncer on a cloud app.
See the buildpack for details.
https://github.com/j-mcnally/znc-buildpak
Set the app's ngrok api key (get one from https://ngrok.com)
heroku config:set NGROK_API_KEY=[API_KEY]
Set the app's build pack with
heroku config:set BUILDPACK_URL=https://github.com/j-mcnally/znc-buildpak
copy your znc config file from ~/.znc/configs/znc.conf into your project.