I think some people have also chosen to download the one required package out of the franken-repo and install that package explicitly.
So just two commands required:
wget http://path-to/zzzzzzz.deb
sudo dpkg -i zzzzzzz.deb
If a package is just non-free firmware then its dependencies may be benign, and the above may work.
Search in this forum will bring up e.g. WiFi adapter not found but I imagine the package versions have changed since then.