Not sure how to interpret the "no audio input" part; for years, I've been able to get into this kind of flow simply by starting a minimalist, repetitive tune on

Not sure how to interpret the "no audio input" part; for years, I've been able to get into this kind of flow simply by starting a minimalist, repetitive tune on a keyboard and let that run for an hour or longer. My most effective place for this is early morning events where the secret sauce is to avoid opening your eyes until the idea that is emerging is fully baked in your memory.