Quite by accident, I stumbled upon a MS support page regarding KB4507704 which deals with DST changes in Windows for Brazil and Morocco:
https://support.microsoft.com/en-us/help/4507704/
This update was released on July 15, 2019 and was last revised on November 7, 2019.
It clearly states on the support page this update applies to Windows Embedded POSReady 2009 and it even goes so far as to give detailed instructions on how to obtain it for this platform:
Specifically,
Windows Embedded POSReady 2009
Method 1: Windows Update
This update is provided as an Optional update on Windows Update. For more information about how to run Windows Update, see How to get an update through Windows Update.
Method 2: Windows Server Update Service
This update is now available for installation through WSUS.
Method 3: Microsoft Update Catalog
To get the standalone package for this update, go to the Microsoft Update Catalog website.
Note: You must be running Microsoft Internet Explorer 6.0 or a later version.
Prerequisites
To apply this update, you must have Service Pack 1 for Windows 7 and Windows Server 2008 R2 installed, or Service Pack 2 for Windows Vista and Windows Server 2008 installed.
There are no prerequisites to install this update on Windows 10, Windows Server 2016, Windows 8.1, Windows Server 2012, or Windows Embedded POSReady 2009 (emphasis mine).
While I realize this is not a required update by any means, I have nevertheless not been offered it via Windows Update, I don't use WSUS and it is not listed in the MS update catalog for this platform.
Did anyone happen to obtain KB4507704 and archive it? Surely it has to be out there somewhere but, despite my best search efforts, I cannot seem to locate it anywhere.
There's something extremely gratifying to me about applying official MS updates on an OS after its EOS support date and if I can do it with this one, I'm absolutely going to.
Any insight, assistance and/or guidance would be greatly appreciated.