I don't know if this has already been said, LdForMe, and I'm way too lazy to check, but you might want to incorporate RC's into the many times you experience a third-person perspective in waking-life. Since this experience probably happens more often than you might think, you might get lots of chances to RC, and create a usable dream sign that just might follow you into your dreams.

We find ourselves in third-person perspective a lot, if you think about it, and not just while watching TV or movies. Playing video games (even, ironically, "first-person shooters,"), surfing the net, even participating in social media can be considered third-person-perspective activities, because the "you" that is operating the equipment is in a separate place -- a separate world, in a sense - than the stuff you're looking at. If you are not participating in a conversation that is going on nearby but can clearly hear it, your perspective, while listening, is third person. If you are a passenger riding in a car or bus, you are effectively in third-person mode because the vehicle and its driver are operating independently of your input or observation.

I could go on, because there are plenty more moments in waking life where you are using 3rd-person-perspective, or feel like you might as well be (like that conversation you just got left out of ). When these moments occur, do a RC. In time you might be able to convert the perspective itself into a dreamsign so, when you are dreaming in the 3rd, you will be reminded to do a RC and get lucid.