I am having wild ideas while away from books, so I can't check.
What happens when rather PeIm the visible species from a target, your mage applies Muto Imagonem to change visible species to taste or touch species?
Still invisible?
Yes, according to HoH:S, pp.64-65:
Species for external senses, like sight, if changed into those for internal senses, like pain, have no effect because they cannot reach the internal organs that detect them
And that, coupled with the fact that changing the nature of species is generally two full magnitudes lower than destroying visual species (Base 2 vs. Base 4) was a poorly thought out design choice, as it makes MuIm would be significantly better at making a target invisible than PeIm.
However, the text at the end of p.64 says:
Using synaesthetic illusions, the species of a weak sense are altered so that a stronger sense perceives them instead. In humans, sight is the most powerful sense, so most synaesthetic spells make species of less-detectable types visible.
So you could interpret it as saying that nope, you can make a target silent by changing its auditory species to visual ones, but not invisible by changing visual species to something else. Or you could just invoke the "if the Level feels wrong just adjust it" to adjust the MuIm guidelines for changing the nature of species so that they are, say, 1 magnitude higher than the corresponding one for destroying the same type of species. This would be my favourite choice.
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