Unfortunately, we can’t achieve your idea now, please check this Feedback below. What you have done is enough, your customize image has included multiple languages, but we can’t improve Autopilot’s function now.
How can we improve Microsoft Endpoint Manager Intune?
https://microsoftintune.uservoice.com/forums/291681-ideas/suggestions/36620998-autopilot-oobe-enrollment-separate-language-and-re
One more thing, we usually use this guide to create our image.
Add languages to Windows images
https://learn.microsoft.com/en-us/windows-hardware/manufacture/desktop/add-language-packs-to-windows
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