That's great! I think going into a little more detail in what the user experience for this user mapping idea would be really helpful so the project requirements are clear. Your requirement analysis experience should help a lot. Maybe that can happen back in the Country Wise List of Users in ODK Forum thread.
@adam.butler thanks for sharing your experience related to the supervisor/local sync companion idea. @Shobhit_Agarwal and I talked a little bit about it in Slack. @Shobhit_Agarwal has some experience with Wifi Direct that could be leveraged. There's now a brainstorming document here to try to expand on this idea a bit.
Yes! Anyone can propose project ideas and describe what skills they could share as mentors.