Change audio config from stereo to dual mono for one segment of a multicam clip?

I am working on a multicam video that has ten source videos, all of which have stereo audio. For one particular segment within the multicam video, I want to change the audio to dual mono, and then mute one of the channels.

Is there an efficient way to do that within the multicam workflow? When I select the segment in question, I don't see any way to change its audio configuration. (See below.)

I know that I can do what I want by bringing in a separate copy of the audio, but I'd like to know if there is a neater way to approach the problem.