I fully know the prublem of donated boats to the sea scouts. Some years ago, in our innocence we put an advertisement in the local paper asking for any donated boat to be dropped at the scout hut on a Saturday morning. Tewnty three turned up! It was easier for people to drop them there than the rubbish tip. After wild plans to restore most of them reality struck and we kept five.
Based on that experience I recommend you remove all the useable parts and have a bonfire with the rest. The plaque has np value.
Good luck.