See, I still have a problem understanding this. If you KNOW French, sure you may get some pronunciations wrong or occasionally use the wrong tense or not have vocabulary immediately available, but not being able to put a sentence together in French means you
don't know French.
Playing a meaningful walking line is NOT so much about vocabulary as it is playing notes with meaning and intent. And you get to that by being able to hear your line as an "arc" through the harmony. Great players hear that arc throughout a whole performance, us lesser mortals try to stay connected as long as possible. But, with respect to various authors, it really is not about "play this on strong beats, play this as an approach note"; that's kind of like saying "Here's a french word, use this at the beginning of every sentence and put this one somehwere in the middle"; you have vocabulary, you have a place to put them,
but it doens't make any sense because you don't know what the words mean and you damn sure don't know if they mean what you want to say. I would say that one of the things
my book speaks to is how to get your ear in charge of note choice, how to hear what you really want to play. I would also suggest a glance at
this thread, it's an exercise that can be used for accompaniment as well as soloing.