Yes, I am an American. Yes, I am in Paris.
I have also figured out a lot of ways to overcome the difficulties of shooting completely alone. For instance, simulating a tasteful handheld look by applying camera motion in post-production, using split-screen and compositing techniques together to achieve the mirror effect, and using camera angles that are fixed to my rolling luggage in the crowd scene, which would basically involve me finding a crowded area, shooting one take and then putting on a dress shirt and jacket for the next.
The idea is that as the audience, we're not sure what's going on, in the same way that the characters aren't sure what's going on. We are subliminally led to believe that this may be a multiple personalities thing... although that's not the ultimate solution.
I intended the whole "Two of the Same Person" Gimmick to be a deus-ex-machina (EDIT: on second thought, deus-ex-machina probably isn't the term I'm looking for, but I'm not sure what IS. I only mean that I have no interest in fully explaining whether there is some sort of breach in the space-time continuum that allowed these guys to see each other, or if they were hallucinating, or if John actually died in his procedure and Doug's side of the story is simply a dying dream). This storytelling device is, to me, unnecessary to explain, simply there to explore the idea of human purpose and duality. The plot/resolution I have alluded to is told in a very convoluted way, but if it was in chronological order it goes like this:
1. A rich, young guy living abroad finds himself chronically dissatisfied with his lifestyle.
2. He explores the issue on the phone with an unnamed friend.
3. He decides to arrange another identity for himself and have his memory erased, convinced that the cure for his dissatisfaction is to take away the human urge for purpose in life.
4. He wakes up without his memory.
5. His immediate response is indeed to search for purpose in his life, asking himself the same questions that his prior self had tried to shed.
6. He displays reckless, alcoholic tendencies when the fake identity his prior self arranged is somehow lacking.
7. He gets a phone call from his unnamed friend, and thus begins on a new search for purpose in life, identity, and companionship.
Moral of the Story: Humans need interaction, identity, and above all, a sense of purpose.
And, madhatter, "Memento" was a huge inspiration for this. I really liked the rotating, mechanical feel of that film and the way it was assembled with different timelines running in different directions. I just wanted to infuse a bit more meaning and mystique into my script than Memento had - in the end, there was nothing to decipher, no real outstanding moral, just a big broad gimmick.
EDIT: Also, I should add that sound won't be a problem. ALL dialog takes place indoors inside my Paris apartment, which is quite easy to achieve. Ambient sound should be fairly easy to get with my setup, propping up my equipment for a few minutes on the street, recording ambient, and foreground sounds like rolling luggage, footsteps, etc.