So I'm looking to install a "Cockpit Power Distribution" strip of some kind.
Given that the original power over Ethernet specs allow for up to 15.4 w of power per port (& that's at 44v DC) then there should be no problem using rj45 /rj11 connectors imho
I don't think RJ connectors are a good choice. They are not very strong, don't carry much current, have no weather protection (and with contacts that close, wow). I am not sure what I would recommend for the connections, other than exactly what he was originally talking about, SAE 2-pin bullet connectors https://www.amazon.com/Quick-Disconnect-Harness-Connector-Bullet/dp/B00MYDR15I