Could there be a bounty for those with the savedroid app installed?
The only problem I see on that one is the app needing to have a German zip code right on the activation page. I can't get pass that.
Pretty sure you can reach out to wider demographics if there is also a marketing strategy to showcase an existing product. Or at least make the app have a demo side for non-germany residents or users without german bank accounts. 
Anyway, I like this ICO. I see lots of campaigns to push it out there.