I recently just put my motorcycle key on a detachable key fob, you’re not likely to cause any damage to the ignition switch, but i found a large number of keys had three major problems:
1. Scratches around the ignition
2. Excessive noise, as the keys would vibrate against the triple tree and handlebar
3. Weight – I mad a left turn and the weight of all my keys was enough to turn off the ignition.