Serial 5 Port question wanting to use AeroBits Remote ID module


I am using a Cube Blue with the ADS-B carrier board. I am wanting to attach a remote id module that needs to be on a serial port, but unfortunately I am using GPS1 for GPS, GPS 2 for Radar, Telem 2 for front Lidar and Telem 1 for Telemetry (Herelink). I cannot change one of those to a CAN connection as those devices do not allow it.

I know there is a Serial 5 on the Cube, but is the ADS-B carrier board using the number 5 port? Is it hardwired in?

Any help would be greatly appreciated. Thank you.