Hi PhantasyMan,
From my experience I've found that we are not the tight single package that our ego would like. Every subtle body has its own goals, every layer of consciousness its own knowledge, and aspects of ourselves seem to operate quite fine on their own info-finding trips.
By writing your above note, you have focussed your intent, maybe more than all the on-again--off again brief thoughts you've had about this self-retrieval possibility. So you have brought logic to the potential and you are on your way.
Have you yet used Bruce's 'active imagination' method (AI) where you just sit down as in a meditation, but lead the session by picturing yourself taking off to look for this lost aspect? Your spirit will take over quickly and create the scenes necessary if you don't try to control the images.
Such a retrieval is not dangerous or crazy, it's a smart thing to do.
It may happen as a dream after the session you'd planned and hoped for. If it doesn't happen within a month, there may be some other reason you are separated from such an aspect--some lesson you are to learn without it.
You are very knowledgeable about many things that you've shared here, you can be confident of that !!
Many readers look forward to your posts!
Bets