I think I tried once with some app with speech delay but is hard to get use to it. Maybe with better earpods which sound better, maybe those singers use? I have seen speecheasy on ebay used, if you really want to try them out. Or I suppose they have like a free trail or something. What i reccomend you is to try to set up a computer for VR. Download a app called oviation speech vr. It is a simulation where you perform speeches in many environments, like offices or face to face or conferences etc. That way you can get use to the environments.