I think Paul810 has the best idea. Keep it simple.

We have discussed something similar in my area. My neighbors range from young, tech-savvy couples to older, retired folks that still pine for their old rotary phone. It would be a huge task to get everyone up to speed on a network and have back-up power / batteries.

As an alternative, the idea of a pen-drive or thumb-drive with the information on it seems an easier idea. Plus, it gives everyone the chance for some face-to-face contact during the update process.