You might …

Echo the Speaker’s irrelevant sounds instead of using a device. Still irritating and makes the speaker aware of the type of irrelevant noises they make.

‘Illegal’ sounds to listen for:
– ‘ah, um, er’, etc.
– the noises people make after swallowing
– clicking tongues
– smacking

‘Illegal’ words – repetitions – to listen for:
– I mean, I mean;
– yes, well, yes, well