Can you use mantras as RC?

My boyfriend just came up with this idea.

Remembering a phrase or mantra and repeating it throughout the day as a RC (after repeating the mantra to ask urself “is this a dream?” in order to get it to pop in a dream so that he can realize he is dreaming. (not related to MILD cuz this is not to command yourself to become lucid, but for the mantra to pop in your dream and so realize you are dreaming) Has any of u attempted this? if so how did it work? do u think this is possible?

I’ve been doing this ever since i started, actually. By doing this you are building up your subconscious mind to check if you are going lucid, which is what i thought you were supposed to do from the beginning. I think it works pretty well, but you have to keep up the habit of doing this.

So yeah, It’s very possible.

TY!!!