I'd be interested to hear more about this. I came close to working on a similar setup but the primary limitations were power and data connections. We figured we'd either need a manual rotation of batteries and storage, or maybe buried PoE to handle both. We never got past the initial concept
Our slow-but-steady concept is down the batteries and storage fork in the road you lay out. Some areas are too remote for infrastructure, so we just revisit and change batteries and cards periodically.
