Reincarnation bros, how plausible do you think it would be to create a narrative in this life that depicts a character that eventually dissolves their own ego, and become heavily invested in it as a means of influencing your own karma so that after death you reincarnate as them (roughly, your other karmic entanglements would probably alter the narrative in existential practice)?
OP, it sounds to me like you are suggesting a 'role model' kind of character. To
>become heavily invested in it as a means of influencing your own karma
would imply that you were willing to let it influence your decisions and actions. Apologies if that's not quite what you meant. If it is, then I would say yes, it is entirely possible. And more than that, the fact that you have this character or narrative in your awareness, would mean that it is there in your psyche already, a part of you which is trying to express. I've worked with sub-personalities in psychotherapy and identifying with an ideal or archetype can be a powerful way of experiencing what it is to be or express that quality or function. Want to be confident? What does 'confident' anon look like? Do they have a different posture, a different way of moving, a different feel, different thoughts? Same with 'dissolving your ego', what does that look like to you, and if you allowed that experience into your thoughts, feelings and body, what would that be like?
You couldn't guarantee that you would re-incarnate as that character fully-formed, but it sounds like your work is to create and express that character. Be careful though as to what you expect from 'dissolving your ego'. Changes have to be embodied and old shit cleared out, or you will risk delusion and unpleasant surprises in the future.