Altiris 7.5 and forcing a job to a windows 7 client

We are currently using Altiris 7.5 with a maintenance window of 10PM to 6AM.  Which for most groups works fine.  We have one group that is 24 hours and we only have a 30 minute window in the middle of the night to force a msi to about 40 machines.  In the 6.9 version this was easy because of the push versus pull.  Does any one know of a way for me to push the MSI to all 30 machines starting at say 3am.