How to upgrade 1903 systems now that 2004 KB is no longer available

[Microsoft Windows]

I have several old systems on an airgapped network that need to be patched. I have found that they're still running Win10 1903. From what I understand through some research, these have to be upgraded to 2004 before I can bring them up to 22H2. However, I can't find 2004 anywhere in the MSFT catalog or online from reputable sources.It's not really an option to pull these machines out of service and reinstall Windows entirely.

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