FYI: Have yet to test this but found HOWTO2852 (https://support.symantec.com/en_US/article.HOWTO2852.html) on the manual install of the Altiris Agent! Looks like it's just a matter of getting AeXNSC.exe off the SMP server then adding the command-line parameters to fit your needs.
In my environment I'm not putting anything in the Start Menu and System Tray, and when doing a push it certainly doesn't prompt for a reboot so need to suppress this. Figure I need to test the following example command-line...
aexnsc.exe -s -a ns="hostname.domain.com" nsweb=http://hostname.domain.com/altiris NOSTARTMENU NOTRAYICON /s
Note that there should be quotes ("") around the nsweb parameter but the Symantec editor removed them. Anyway, hopefully this will do the trick for me.