Channel batching

I think you're describing node-sharing, whereas channel batching is a batch open of channels on-chain to multiple nodes at once.

Scenario: You run a Pub, but have no channels, your only balance is trusted at another Pub. Either your or their Pub could advertise/solicit a batch open position, and then apply your balance towards that.

Since we already have the connections and node identity over Nostr, we'd use that for additional coordination... These batch opens might even leverage the broader Nostr web-of-trust, and the incentive exists because batches reach almost 80% savings on opening costs with just a handful of participants