Just to expound upon this for a moment, the above link refers to KB4519108 which is for DST changes in Windows for Norfolk Island and Fiji Island; however, after clicking on the above link I noticed something "new" that hadn't caught my eye before:
When you expand the Applies to: section at the top of the page for KB4519108 by clicking on the More link, lo and behold, Windows Embedded POSReady 2009 appears at the end of the list.
Scrolling further down the page to the How to get this update section and specifically under the Prerequisites section it says:
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)
Of course, there are no working methods to obtain KB4519108 for Windows Embedded POSReady 2009 as there are for all the other OS's listed, but I do nevertheless find the inclusion of it interesting. Yet another oversight on the part of MS, I guess.
And last but not least, a big thanks to @win32 for your custom cumulative DST rollup update and always quick turnaround time.