Interesting idea. However I don't think will be possible to add it to the game. There is a lot of ways how to abuse this system. Players could create a lot of alternative accounts so they could stack coin bonus. But on the other hand I agree with you that it could solve this big problem/gap between new players and old players on old servers. But I will for sure share your sure share your idea with devs. Keep up the good work, really nice suggestion !
And please, don't compare this game to UN. We can't just copy and paste their features. There is that magic thing called "copyright". ; P