I have now exercised my right to ask for someone else twice for purposes of conference speaking.

Both times it is men who unintentionally make me feel uncomfortable. I have done it from the experiences with men who intentionally make me uncomfortable.

Do I regret asking to change people who I interact with on stage? Usually not. Would I if I didn't? Possible.

The power we have over things is very limited, and exercising any control over personal comfort other than walking away silently is most likely punished.