Hi,
According to your description, you don't want to force modify the Normal.dotm file to override the user's personal settings.
As the article said, for Word there are no direct Group Policy Objects (GPOs) to set the default font in Word (for both Microsoft 365 and 2016). It is recommended that you try to force the use of a template to see if the template can specify a font.
For Outlook, I suggest you refer to this article and try the method:
https://learn.microsoft.com/en-us/archive/msdn-technet-forums/41c39e1e-3d1a-4f8f-bf9c-cb41d94c4a00
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