Can you use Big Sur’s Content Caching Server to save and retain updates which can substitute for ‘delta’ and Combo standalone update packages?
Content Caching
The latest version of iTunes is a blow to those with several iOS devices, as it no longer lets you sync new apps and updates to them. Apple’s solution, though, could bring even worse problems.
Additional info about how you can install and upgrade to High Sierra, its new Content Caching feature, how it changes firmware updates, changes to NVRAM, and more.
The Eclectic Light Company 