Dear Dr_Nick_911,
Thank you for posting in Microsoft Community.
Based on your description, I totally understand your concern, and I checked from my side, but currently there is not any particular shortcut key option available to achieve this specific requirement.
Yes, I have gone through your scenario, I believe that it is very required things for Outlook for Mac, and to make some convenient or easy way, would you mind to sharing your valuable suggestion directly to our product developer team via feedback portal? Because they are regularly reviewing users' shared experience on feedback portal, and they can update or do necessary changes on product service in future based users' shared experience or valuable suggestion.
Here is our official URL to submit your suggestion: Microsoft feedback portal
I would really appreciate your precious time and kind cooperation.
Stay safe and healthy.
Have a nice day!
Sincerely,
Darpan