Hey there,
Phew, very difficult question there
The thing is, in your 'mantra: quite eating bacon' example, I am wondering what exactly you're influencing. Sure, self-condition and self-suggestion can have definate effects,
but are you influencing your unconscious, or your consciousness?
Lets take the bacon example. You want to eat less bacon. My first impulse then would be to ask: why? There's got to be a reason why you want to eat less bacon. And that reason is always implicitly present in your mantra. (You want to eat less bacon, because...). Now the reason for your desire to eat less bacon could be conscious, or unconscious, but the desire itself is obviously conscious (if you can talk about it it is by definition conscious, as the unconscious things are that which are consciousness is not aware of).
Now you start with your mantra or self-suggestion. And what are you truly doing? You're affirming the conscious part of your desire (I want to eat less bacon) to your consciousness! In other words, you're trying to make sure that this idea that you want to eat less bacon is constantly in your conscious awareness, so that you won't forget, and won't find yourself going 'damn, I was supposed to eat less bacon' after the fact is already done.
Does this truly affect the unconsciousness? Not so much, I think. (Although it could be argued that by doing so you're providing new unconscious associations, or altering the strength of unconscious associations. But then again, like I said in a previous mail, everything does

)
In short, what you're doing is trying to ensure that whenever you're faced with bacon, something enters your consciousness (I shouldn't eat bacon!)
Now we take the dreamsituation. Sure, you have your 'unconscious translator' there in the form of a dreamguide, but does pronouncing your conscious wish to him/her/it really affect your unconsciousness? I do not see why it would be different in dreams (under psychoanalytic theory, that is. Remember that psychoanalytically speaking, the working of the unconscious remains the same whether dreaming or waking, its only the working of the consciousness that changes).
Now don't get me wrong, I'm not saying it won't have an effect. In fact I think if you believe it will it probably will. I'm just saying I think this is mostly a conscious process, rather then an unconscious one.
So to answer your question:
might it help us in our daily lives to, in lucid dreaming, give ourselves (in the form of an "avatar" of our conscience, or subconscious, or whatever is projecting our internal dialogue into the forefront of our minds) advice?
Yes, but ...
A dream being a more memorable and subconscious-sensative arena?
I don't think so. I think it would help because of the amount of effort needed and the speciality of this sort of mantra would further help your determination and sharpen your will to do this
I don't think it will have an effect because you're influencing your unconscious in some special way
Just my 2 cents,
-Redrivertears-
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