Maybe just ask for donations and paddlers/rowers can mail a $10-25-50 check to a p o box, and in return, get a red, silver, or gold Fish & Game " Support NH F&G" sticker in the shape of a Dudley Do-Right character.
Registering an 11' jon rowboat for use with a 30-lb thrust, electric motor on the stern, runs about $50/year, so lots of paddlers would probably volunteer for $10 or 25 which is still half price.
Easy to administer and nothing to police ..... either a kayak has one or it don't .... is all the same ...... all volunteer stickers with an animated Dudley Do-Right
https://en.wikipedia.org/wiki/Dudley_Do-Right showing the F&G logo .......... a Dudley Do-Right character with the broad brim ranger hat.
Many would probably kick in ten dollars just to display the funny look'n red Dudley Do-Right sticker that shows their support.
Who knows ..... maybe a Dudley Do-Right, NH F&G sticker, would attract national attention and bring in more money than expected ...... strange things like that have happened .... especially if it gives people something to smile about?