I don't think so, but I also don't understand why a coincidence-free Dopfer experiment could not be performed. We'll see.
Followup Note (11/28/2014): It took some time to understand the "show-stopper" implicit in quantum mechanics that blocks observer-to-observer EPR communication using quantum nonlocality with switchable interference patterns. However, by 2014 I and a colleague finally understood the subtle mechanism, and this work is written up in a paper that can be accesses on the ArXiv at: http://arxiv.org/pdf/1409.5098.pdf . Briefly, nonlocal communication using switchable interference patterns cannot be done.
John G. Cramer's 2016 nonfiction book (Amazon gives it 5 stars) describing his transactional interpretation of quantum mechanics, The Quantum Handshake - Entanglement, Nonlocality, and Transactions, (Springer, January-2016) is available online as a hardcover or eBook at: http://www.springer.com/gp/book/9783319246406 or https://www.amazon.com/dp/3319246402.
SF Novels by John Cramer: Printed editions of John's hard SF novels Twistor and Einstein's Bridge are available from Amazon at https://www.amazon.com/Twistor-John-Cramer/dp/048680450X and https://www.amazon.com/EINSTEINS-BRIDGE-H-John-Cramer/dp/0380975106. His new novel, Fermi's Question may be coming soon.
Alternate View Columns Online: Electronic reprints of 212 or more "The Alternate View" columns by John G. Cramer published in Analog between 1984 and the present are currently available online at: http://www.npl.washington.edu/av .
A. Einstein, B. Podolsky, and N. Rosen, Phys. Rev. 47, 777-780 (1935).
B. Dopfer, PhD Thesis, Univ.
(1998); A. Zeilinger, Rev. Mod. Physics 71, S288-S297 (1999). Innsbruck
Exit to the website.