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To remove a keyboard under Windows 10 is done this way :

Method 1 : Settings

1. Select the Start button
2. Go to Settings > Time & Language > Region & language
3. Under Languages, click your language
4. Click Options
5. Under Keyboards click your keyboard
6. Click Remove

Method 2 : Preloaded

1. Use regedit to navigate to following registry keys, where you will find there the list of keyboards that are preloaded at boot.

• HKEY_USERS\.DEFAULT\Keyboard Layout\Preload
• HKEY_CURRENT_USER\Keyboard Layout\Preload
• HKEY_USERS\.DEFAULT\Control Panel\International\User Profile
• HKEY_USERS\.DEFAULT\Control Panel\International\User Profile System Backup

1. Find the keyboard identifier among the list of Keyboard Identifiers
2. Delete the key.

$LangList = Get-WinUserLanguageList
$MarkedLang = $LangList | where LanguageTag -eq "<languagecode>"
$LangList.Remove($MarkedLang)