Workstation updates - best practices

I have about 80 Dell Precision workstations that I manage. These stations do not have internet access. I would like to know some recommendations for keeping the drivers, bios and firmware up to date for these stations. I already use Dell SUU for keeping the Dell servers up to date, but for workstations, I mostly wait until I have to rebuild one (rare event) before I check the drivers for updating. Is there something like SUU for workstations? As I said, these stations do not have internet access, so something like Dell Command | Update doesn't look like a good fit me. Thanks for any help.