You've put to words what I've been thinking about for many years. I'm one of those people who find languages difficult and often find it difficult to convert my thoughts into words and sentences. From my perspective, 75 percent of mental effort goes into sentence formation and this process often derails my thought process.

When I discovered NLP models like Word2Vec and Thought-Vectors, which assign vectors to words or even whole sentences/concepts, intuitively, it felt like that was exactly what was happening in my mind. It might be an illusion but I do not think in sentences or words, I only think in concepts and images that appear in my mind's eye in an instant. To form a larger idea, I build a chain of concepts. I am sure that eventually probes can pick up a clear distinct vector that uniquely summarizes the entire concept of what I was thinking or visualizing.

And as you suggested we could start off with a smaller subset of semaphores or concepts or visualizations that at first are the easiest signals to pick up via probes. After practice, these signals only get crisper.