New
#11
Sorry for taking so long to try this out, but yes it seems to work, but does require to not tinker with the current language (even if not applying it), otherwise the kb layout is readded. So repair install using local language iso or your trick seem to work.
I toggled the options which would normally make it reappear (the switching input method stuff) and it stays off.
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Luckily all seems good after the in-place upgrade install now on both laptop and PC, I had to reapply the latest CU, and all seems well. The en-us language is completely removed now on both systems.