To solve similar problems, I use a table that stores the name of the print job, and the default printer for the job. ( plus other parameters )

If I want it to print at the USER'S default printer, I store "DEFAULT" in the table, rather than the network name of the printer. At run time, I parse the info to determine if I need to do a getprinter() or set to the local default, or print at a fixed destination. Only the administrators can move print jobs.

lots of code, but it gets the job done!