For now, since there are no good preferences, let's just put the street name without the (). It will be confusing, yes. However, in cases where the user is looking for a street that he/she is not familiar with, putting the Kelurahan will not help either. For example, if a user from Jakarta is looking for Cendrawasih in Sleman, if you put Cendrawasih (Kel 1) and Cendrawasih (Kel 2), we're not sure whether he/she will know anyway.
This is a "open-a-can-of-worms" issue, and there's no good conclusion yet. So don't create more confusions/new standards first. Right now there are a lot of pains already with users putting something like "Kec. A, Kabupaten B" in the city, which is hectic.
Don't understand what you mean. Can restate? In Indonesian is fine.