I once was asked if it would be appropriate for a deaf man to bless the sacrament using sign language, since it is important for the members in the congregation to hear the words and understand the prayer in the moment.
My response was twofold:
1) Ideally, I would have the congregation open their eyes during the prayer in order to "hear" the blessing as it was signed - after spending time in all the meetings for every age group teaching everyone to understand the sacrament in sign language.
2) As a second option, I would have another Priest verbalize the prayer as the deaf person signs it.
The most important thing in this case is that a worthy man be able to participate in administering the sacrament, since there is no good reason to keep him from doing so.
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