What kinds of experiences are you trying to recall? I'm sure it would take a lot of working with the deepest parts of your psyche to unlock such unconscious memories. I'm not certain exactly how you would do it, but lucid dreaming does sound like an option.
However, doesn't it all stem from being connected back to the very beginning and the source of all creation? Once you become more connected back and in-tune with yourself, your environment and your mental processes so many things are possible.
I've opened up things in my mind as just part of a process but I didn't really use any special techniques, in fact I wasn't even sure what was going on most of the time up until recently.
Deep meditation might work, but ultimately what you're striving for is breaking down the mental barriers that encase your world view and systems of operation in your mind. Then the space between your conscious and unconscious mind/memories will come together eventually.
hope this helps a little.
