If I remember right, you can create a CL program to receive the messages for that message queue and send them on to Qsysopr. Then you attach the program to the message queue that you want to monitor.
In the program you would use the RCVMSG command to get the messages sent to the queue, then use the SNDMSG command to forward them on to Qsysopr.
The command to assign the program to the message queue is:
CHGMSGQ MSGQ(xxxx) DLVRY(*BREAK) PGM(pgmlib/pgmname)
Hope this helps.