Hello Tyler_MW,
Thank you for reaching out to the Microsoft Community.
According to your description, you are seeking a solution to update Microsoft 365 Apps (Office) without a user being signed in.
After reviewing the scenario, I regret to inform you that, at this moment, it appears to be a design limitation.
As a workaround, as you mentioned, you can use the "Click-to-Run" versions of Office. Alternatively, the Semi-Annual Enterprise Channel for Office updates provides new feature updates twice a year (in January and July) after the feature updates have been released to the Semi-Annual Enterprise Channel (Preview). Security and performance improvements occur monthly. This might be a suitable option for machines that are not used regularly, as it does not require frequent updates.
Meanwhile, I also believe that some specific configuration or settings options should be developed under the Microsoft 365 applications, I do understand your concerns about how it can help you be more productive in your busy daily work schedule, but since it's related Microsoft 365 product services and features option under product design, I believe that the related product team can develop some convenient configuration based on customer requests.
Therefore, Microsoft recommend submitting feedback by going in Ideas · Community (microsoft.com)
This community team and the Microsoft product development team are separate. Therefore, for features suggestions or design queries, users need to submit feedback to the Microsoft product design team from their side. Once a user sends feedback through the above means, it will sent directly to Microsoft and routed to the relevant product team so that can review it to do specific development in different OS devices.
To see more details on how to submit feedback, see this article Learn how to provide feedback to Microsoft - Microsoft 365 adminsMicrosoft Learning.
I hope I have provided you with all the required process information for this current scenario. If you need any further information from our side, please feel free to do so.
I would really appreciate your precious time. Thank you again for your kind cooperation.
Have a good day.
Sincerely
Feroz Mahmud | Microsoft Community Moderator