This is a very thorough treatment of the question of choice - and your conclusion seems to be that reality is founded on choice. This is true, with the caveat that as evolution proceeds, the domain of our certainties and predictable outcomes expands. Our perceptions are determined by choice at any given moment - but the resulting facts are added to the body of our more or less permanent knowledge.
This points to the fact that the field from which we choose at any moment exists independently of us, and we are continuously evolving upon its surface.
My focus, as you might have gathered from my essay, is increasingly on the evolutionary aspect of both observer and Cosmos, and the effects of their continuous correlation. I submit that it is in this area that our key assumptions must be reconsidered.
The evolving observer is continually assessing reality based on memory and expectation. Evolution never stops. At every moment of perception, past and future are drawn together to create the present; and the result is either an evolutionary improvement, or a defect.
Thus, the observer is always 'measuring up' reality - Bit (mind) and It (the field of observation) never enjoy a stable relationship: they are in perpetual correlation.
Though this describes my take on the subject of choice (it is subject to a greater reality, one that we are continually discovering), it was interesting to immerse myself in your very thorough working of the subject, and I wish you all the best in the competition.
John