Here is a suggestion I have made before (and will continue to make )-

See how long you can balance on each foot. Go for your maximum time and don't worry about the two second ones. And throw out any obvious flukes on the high end too. Write down the two values (right and left) on your calender.

Now try out the magnets for awhile. Don't add anything else new during the period. Then repeat the two balance measurements. If there is a noticeable jump in the nmbers, let me know.

This is a great test for Parkies to quickly determine if something is worth further experimentation. It simultaneously tests strength, balance, sensory function, and who knows what else.