I have no doubt that rewiring like that can and will happen. But then there's the question of why introducing new photoreceptors is special in this regard. And if this type of stimulus can't be produced by other means (like seeing the world through a special camera setup, like I mentioned), and, if so, if such other means could in fact produce novel color qualia. After all, all we're doing is making some modifications to the most superficial part of the visual neural system.
But then there's the question of why introducing new photoreceptors is special in this regard.
Because introducing new signals from new photoceptors changes the network dynamics and leads to new concept learning.
And if this type of stimulus can't be produced by other means (like seeing the world through a special camera setup, like I mentioned), and, if so, if such other means could in fact produce novel color qualia.
From the information you provided, I suspect that the deuteranomaly case is functionally similar or equivalent to the bichromatic case....
It seems possible that soon there may be a cure for colourblindness. The Mary's Room thought experiment attempts to pin down something about the nature of qualia in a contrived but similar situation, but my feeling is that the actual result of such an experiment would not be obvious. Would we consider the experiment valid if it was performed on somebody familiar with blue and green, but not red?