If I knew the command line for this specific pack, I would sure use it. Tired what you showed, changing US to UK, but to no avail.
To find Apps full names use
Get-AppxPackage -AllUsers | Select Name, PackageFullName
Using asterisks makes it easier.
Get-AppxPackage *LanguageExperiencePack* | Remove-AppxPackage
Then, you can install the correct package but as already explained by fg, to avoid the bug you have to install the previous version.