Try making your own PoE Splitter.
1. Send pins 4,5,7 and 8 to a PoE USB Splitter of your choice for USB power and then send pins 1, 2, 3 & 6 for 100BASE-TX Ethernet.
2. PXE Boot will still work.
3. USB power can be cycled in software.
1x RJ45 Cat5 Network Lan Cable Crimpers
1x RJ45 Female Connector
2x RJ45 Male Connectors
5 or 6 feet of CAT5 or 6 LAN cable or as little as 12" for smaller splitters.