how to "wrap" printer output with PJL and PCL printer commands?

List,

I am trying to set up access to some of our network printers from our 
iSeries. I have it working with the exception of one issue. One of the 
printers is a Canon ImageRunner printer/copier system. This unit has 
"mailboxes" that are assigned to various users throughout the company. When 
a user prints to it, the properties for the printer on their desktop is set 
to their personal mailbox. That way the document(s) are stored there until 
they are ready to be printed and doesn't interrupt any one who is using the 
unit for copying and/or printing.

Ideally, any print sent from the iSeries should also go to a designated 
mailbox. Canon support provided me with the necessary PJL and PCL commands 
necessary to route the print to a mailbox. But, I have to "wrap" the print 
with these directives before it is sent to the printer.

What options do I have to wrap any print that is directed to the OUTQ 
attached to this printer with the necessary commands? Any suggestions and 
ideas will be appreciated!