Have anyone used the PoE-over-Coax from Dualcomm/Pairtek? This one can pass PoE power too.
Ethernet PoE-over-Coax Adapter Kit
https://www.amazon.com/Dualcomm-POE-over-Coax-Adapter-Kit-DECA-200/dp/B076XNYR2H/ref=sr_1_3?keywords=dualcomm&qid=1552541563&s=gateway&sr=8-3