I know a few uni lecturers with ADHD that hold a clickable pen, standing still is harder for them so they use the clicker of the pen to distract their kinetic impulses to physically move, their still moving but in
a less obvious and
a more appropriate way for the situation
of public speaking. I think the clicking can be distracting to some, but things like mini bean bags, squishy balls, knobbly objects can be useful if you need tactile and or kinetic stimulation to keep you grounded.