It's a neat idea, but I don't have a good way to produce a small run of them without the cost being immense to backers.
I was thinking of suggesting that for some of the requests people have you could pair up with a company. For the wooden tokens for Scythe: Invaders from Afar Stonemaier paired up with Meeplesource and the tokens were developed and marketed by the time the expansion came out.
I understand that added complexity is a huge burden in a Kickstarter, especially for a smaller company, and opens up a lot more possibility for things to go awry.
Going with a company that has expertise, contacts and infrastructure in place could allow these things to be made with hopefully not too much extra work and risk.