How about we commission bumper badges for the first 1000 with the production number of each 3W on?
While this would be nice to have, there are a couple things working against this being feasible.
First, you would be ordering a one-off badge for each person, as the number would have to change. So, each badge would cost at least $150-$200.
Then, most places require that you place an order of at least 35 units. So, you would be tasked with recruiting interested parties, pre-selling the badges to these people, verifying their actual build number, getting the artwork created for each and then shipping them all out.
EDIT: I would offer to design something though if there was enough interest from others to fill the required rolls needed to get this project carried out.