You definitely need a 250,000 goal and maybe a bigger one.
Something easy enough that it doesn't cost you more than you get but so cool it infects more and different people.
Calendar? Board game? T shirts? A second deck? Maybe a cheaper deck that can be handed out like swag or gifts to infect the masses. Golden tickets to the permie factory laboratory?
"You must be the change you want to see in the world." "First they ignore you, then they laugh at you, then they fight you, then you win." --Mahatma Gandhi
"Preach the Gospel always, and if necessary, use words." --Francis of Assisi.
"Family farms work when the whole family works the farm." -- Adam Klaus
I'm going to out myself as a nerd, but one of my favorite games growing up was called "Krill." the idea was to build aquatic food chains out of the cards that a player was dealt. there were plankton cards, and an upwelling card, and gulls, and squids, and whales, and trawlers, and leopard seals, and a whole lot more. not a terribly complex game, but pretty fun and fairly educational.
I think a similar idea could be adapted to permaculture relatively easily. basically, there's a deck of design elements, and the players try to arrange them into a functioning system or systems. while playing a game, folks could get some understanding of how the divergent ideas that fall under the umbrella of permaculture fit together. they would even get some practice at actual designing.
a good idea for a stretch goal? I don't know. might work, though.