Is there any way to expand the number of GPO ports of a Zebra FX9500 Fixed Rfid reader?

Dear All,

Is there any way to expand the number of GPO ports of a Zebra FX9500 Fixed Rfid reader?

We would like to assign each antenna to a GPO port (that means every single antenna would be dedicated to one GPO port),

but in case of a 8 antenna ports version of FX9500 the RFID reader having only 4 GPO ports...

or

Did any of you tried to use any third party solution like a USB or Ethernet relay board which handled by the software and hardware of an FX9500 RFID reader?

Thanks.