There in no question that moving the lateral (side) teeth "out" and the front teeth "in" will make the two front teeth seem less prominent and will look smaller. You will have to have full orthodontics because the lower teeth need to be aligned to achieve the movement of the upper...
Sounds like you are a well informed patient. I would not recommed feldspathic on an implant abutment because it is brittle and will likely break over time. Feldspathic needs the bond to tooth structure (mostly enamel) for its strength. A zirconia abutment just does not bond to feldspathic...
In order to get all your "smiling teeth" in the proper proportion to one another, and to close the gap, you would require 8-10 Porcelain Laminates on your upper front teeth.
