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Comment empêcher Windows 10 d'ajouter automatiquement des dispositions de clavier (par ex. clavier US)

ayi

Mise à jour : this is a lengthy post, vous pouvez jump straight to the answer below

Note : The quick language list refers to the list in the screenshot below, accessible throught the shortcut Win + Space bar

J'ai two languages for windows spell check in my system, English (United States) and French (Switzerland), but despite both languages being properly configured with "Swiss French" input keyboard, US Keyboard input keeps appearing on this list:

Here's the settings for English (United States) language, vous pouvez voir the only input is "Swiss French":

Same for Français (Suisse), the only input is "Swiss French":

In the Panneau de configuration, both are also set as Swiss French:

All my settings are set to use "language list":

Here's a few things that I already tried:

I already managed to remove it by some language configuration gymnastics, by adding and removing languages, it always eventually comes back
J'ai unlready done this: https://superuser.com/a/484595/168632
There's no mention of US Keyboard in my registry settings either:

Please help, I'm desperate, this is my third computer with Windows 10 and they all do the same thing.

ayi

To fix this issue, delete the Preload registry folder and sign out or restart the computer:

HKEY_USERS\.DEFAULT\Keyboard Layout\Preload

This folder seems to be some legacy remnant that contains non-user-specified disposition du claviers to be added to the list of languages when the user signs in. While the fix itself works through restarts, at time of writing there's things that bring back that pesky folder, here's a few that I bumped into personally:

Remote desktop to a computer with US layout
Using the same Microsoft account on another PC that still has this
issue

Whenever the problem comes back, that registry folder needs to be deleted again.

Modification 2:
Thanks to @Lu55's suggestion, here's a handy one-liner to use on a invite de commandes with admin privileges:

reg delete "HKEY_USERS\.DEFAULT\Keyboard Layout\Preload" /f

Modification :
J'ai created a RemovePreload.reg text file with the following content, this way this fix can easily be re-applied every time without navigating le registre:

Windows Registry Editor Version 5.00

[-HKEY_USERS\.DEFAULT\Keyboard Layout\Preload]

To use this, save it in a text file and change the extension from .txt to .reg. Then whenever it comes back, vous pouvez just double click it and restart or sign out.