It’s usually best to keep related questions in one thread. Creating multiple threads likely will not increase the chances of your content being noticed, or indeed, elicit greater response.
The forum is seldom ever empty. I imagine it was simply a case that nobody had an answer for you. However, I’m glad you managed to find a solution.
Cheers.
Also, to the best of my knowledge, it should not be possible to use two separate keyboard layouts concurrently - as the errors presented during boot would tend to make obvious. The best workaround is possibly something like you have already found to change the keyboard layout only temporarily.