I hope I'm in Florida when this Event comes together!!!
As for the Icon question, I believe many coin enthusiasts would want a unique icon.
Since you seem to only expect to have a small quantity of Coins, you really need to consider costs
of a unique icon. I also believe many cachers who attend an Event appreciate a Coin as a remembrance. As long as it is trackable (at Geocaching.com)some will not care if there is a unique icon. As with anything, there will be lots of different opinions!!!
I'd want a Coin as long as it was trackable, no matter if it had the unique icon or not!!!
All the best for the planning and execution of the Event and Coin!!!