As a follow-up PR, I think we should remove Keyman_ForceKeyboard altogether. It's totally legacy now, as anyone wanting to use a keyboard directly should host Keyman Core (as Keyman Developer Debugger does). We only use it in some really old manual tests (I checked) -- which we can leave alone at present.

That will be MUCH tidier, because the whole messy ownership of _td->lpActiveKeyboard problem goes away.

Originally posted by @mcdurdin in #8593 (comment)