Setting Language and Keyboard at end of SCCM Task Sequence without unattend.xml

Question

We are creating a non-standard SCCM task sequence that will be used by our hardware vendor and we have a need to be able to set other language and keyboard after the install windows and unattend.xml steps are run. The task sequence uses offline media and runs in two phases. The first half is run in the factory and that is where Windows and most apps get installed, but then a second half runs once the system is brought online in our network and then a UDI wizard kicks off and the tech gets the opportunity to specify language and keyboard settings. The problem we are having is that we can install the language pack based on what is entered in the wizard, but we can't make them the active default. Everything I'm finding on this talks about using the unattend.xml, which is how we do it in our normal on-prem task sequence, but that isn't an option with this scenario.
Does anyone have a method to set the default language and keyboard at the end of a task sequence?

Thanks,

Answer 1

Can you do it similar to how you'd do it for In place Upgrades?
I'm using a process based on this: https://execmgr.net/2017/09/20/installing-language-packs-windows-10-waas/

Answer 2

I found that method after posting this question. We will give this a try and see if that resolves it. Thanks for the help!

Answer 3

So far we haven't gotten this to work. We opened a case with Microsoft and have been told that changing it any other way than using unattend.xml isn't supported. We are trying to escalate that while we keep working to get this method to work.

Answer 4

There are built in steps for that in TS. But it is recommended to automatate it during OOBE, not at the end.