The first sense of colours isn’t like the second sense of colours. The second sense of colours refers to the qualitative character of first-person visual experience, and this qualitative character is nothing like the microstructural properties that cause an object to reflect a certain wavelength of light.
Given the biological differences between two different organisms (e.g. of different species), it’s possible that the colour experience of one observer is radically different to the colour experience of another observer (e.g. as in the inverted spectrum hypothesis) when looking at the same object, and it makes no sense to say that one or the other is seeing the object’s “actual” colour and the other is seeing the “wrong” colour.
And when the OP says that we can be made to see “novel colours” they are referring to colours in the sense of the phenomenal character of first-person visual experience, not to the microstructural properties that cause an object to reflect a certain wavelength of light.
Well, you said “with the [causal] link, you see the object’s actual colours” which seems to be an endorsement of naive colour primitivism.
If instead by “see the object’s actual colours” you only mean “the object’s microstructural properties are causally responsible for the colour experience” then you are simply asserting the vacuous tautology that when the object’s microstructural properties are causally responsible for the colour experience, the object’s microstructural properties are causally responsible for the colour experience.
After distinguishing perceptual experiences (you see their cause) from hallucinatory experiences (you don’t see their cause), it seems to me that the colour experience evoked by the lasers is hallucinatory (you see an image but its colours are elicited by stuff you don’t see (the process of lasers stimulating individual cells in the eye).
Thus the colour experience is detached from the object of the experience (the image). But that’s also how it is possible to enhance colours or elicit entirely new colours.