This is an interesting idea. One of my long-term goals has been to gradually develop a fairly continuous sense of self-awareness as close to 24/7 as possible, throughout the day and night, though this currently doesn't necessarily mean a continuous RC (though I do RCs fairly frequently). If I understand the basic concept correctly, maybe it wouldn't be too hard to incorporate into my routine, simply doing it along with my usual trying to keep my general focus on my existence (self-awareness).
It's essentially about just learning to pay attention to and become familiar with how the body physically feels, correct? I guess it needn't be limited to gravity, but just generally paying attention to all the general sensations and learning to always be on the watch for inconsistencies.