Why not create a P2P server that runs on something simple like a raspbery pi to provide supporting backbone for the network. They are cheap and small. This could make an awesome kickstarter project. Maybe make it like a keychain that wakes up every 5-15 minutes to update/broadcast messages
There is a project like that, in fact (full disclosure: I am the developer): https://github.com/danstaples/MediaGrid. I bet SplinterNet could integrate well with such a backbone network.
