just to say, i've used substitute eyes without all the complicated methods and never had a problem or heard of anyone having a problem.  i have BlackEyes (light) and Awful Eyes.  BlackEyes have been pretty popular, but i've never seen anyone ask how to use them before.  maybe i'm just missing some confusion people have had, but imho, you've got a rather complicated and technical solution to a problem that doesn't exist.  and created a usability problem with really odd and particular features like phantom eye parts people will have to research to understand.  so if it's also creating a problem with basic eye function, i would vote for just eliminating the complexity rather than creating more of a kludge to get around any technical problems it might create.