Todd Godchaux We have no plans at this time to delay the end of service for Windows 10, version 1809 PRO. Our recommendation, as you are already doing, is to up-level to Enterprise, to automatically receive an additional 12 months of servicing. For those customers with a management tool, this can be done with no user impact - no reimage and not even a reboot. See https://docs.microsoft.com/en-us/windows/deployment/upgrade/windows-10-edition-upgrades for more information.
If you're not using a management tool, you can also up-level to Ent via a Command Line (changepk.exe): https://docs.microsoft.com/en-us/windows/deployment/upgrade/windows-10-edition-upgrades#upgrade-using-a-command-line-tool or simply on a machine by machine basis: https://docs.microsoft.com/en-us/windows/deployment/upgrade/windows-10-edition-upgrades#upgrade-by-manually-entering-a-product-key.
Hope this helps.