Hi Bill,
Thank you for coming Microsoft Q&A.
I noticed you said RunAs /savecred not work as you, but I am not sure if you could create that application shortcut and give add administrator to that shortcut to let users run update by themselves. If haven't try, I would recommend to try and check.
Here is a link about detailed steps.
How To Create a Shortcut That Lets a Standard User Run An Application as Administrator
As SCCM have a specific function to deliver software update and manage software update in software center, so we could consider to use SCCM to manage clients. It would be more convenient, but need to cost money on SCCM.
Here is the management function introduction.
Or we could use PsExec to execute update action on remote systems. If you have any issue about this command line, I would recommend to contact with Script forum.
Bests,
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