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This answer indicates that today Cohanim with disabilities may duchen.
I am asking here if a deaf person may do so, not because he is disabled, but because he cannot hear the prompt by the Shat"z. Can he rely on either something giving him a hand signal of when to respond or watching his neighbor's lips move? Or does a Cohen's response absolutely require hearing the Shatz's prompts?
Thanks to @DoubleAA for the wikisource which says regarding a deaf person who speaks but does not hear. (There are various classifications of a "cheresh" in halacha. Most "deaf" people today do not fit into the classical definition of the "cheresh" mentioned in the Talmud which was a deaf-mute.):
נשיאת כפיים: כהן חרש המדבר ואינו שומע כשר לנשיאת כפים
A deaf Cohen who speaks but doesn't hear is considered valid for raising the hands (duchen).
