In a sense what your talking about is possible, I have known of a few members of this site who use 24/7 awareness meditation to automatically become lucid in almost every dream they have. It has been a while since I was active so I can't remember what their username was. hmm They always had the highest number in the LD count under their avatar that I ever saw.

I can tell if I am dreaming without a reality check, for the most part. Now that Burke mentions it, I am actually doing the gravity RC. I have just become accustomed to the subtle differences between what my body feels like in waking life and in dreams. Now, this doesn't mean I can stop using techniques. I have had a very long dry spell with only random lucids here and there because I focused on other things in life and stopped dream journaling. Without RCing all the time there is no habit of questioning if your dreaming in the first place. Likewise, if you get good at dream recall you should keep dream journaling because doing it reinforces the mindset that dreams are important and familiarizes yourself with your dreams. Most techniques are there for discipline and honing our subconscious like you said.

What you should do is continue doing nose plug RCs all the time and constantly be aware. If you get good at the gravity RC you will know you are awake before your hand even reaches your nose but you should plug it anyways out of principle. You will still be wrong sometimes so it's good to have a back up. Its pretty uncommon to be wrong about actually being in a dream though so if the gravity check passes you can take or leave the nose plug and start having fun.