@EM724 I think your closest option would be to use a Balance20x with the EXM-MINI-1LTEA-R expansion module to get access to firstnet.
YES Gigabit WAN Interface
YES Gigabit LAN Interface x4
NO POE LAN for Cisco type phones
YES 802.11 Wi-Fi (latest standards)
Via expansion LTE-5G Support and be FirstNet Certified
NO internal antennas Small Form Factor with integrated antennas similar to many home network routers
YES Support high speed throughputs for VPN capability, phone support, Wi-Fi calling, Zoom/Teams/WebEx meetings
NO WAN Dual Power capable (Wall-Wart DC supply for normal operations, DC input for backup power supply).
I am pretty sure I tested the 20x with passive power on the WAN and it didn’t work
See my posting here on passive poe:
For dual power I’d use either a 12v UPS posted on this thread
Or use a desktop style UPS.
I know this doesn’t fully fit your needs, but thought I’d try to help.