Not all Indonesian providers blocked duelbits, I'm using Indihome and I still able to access duelbits without any issue. Telkomsel blocks it indeed, but I havent tried other provider since I use these 2 providers only. One for home internet and the other one for mobile when I'm not at home. However all providers will block duelbits sooner/later, so having mirror sites will be very useful for those who have similar situation like Indonesian players.
Some providers who have blocked duelbits, xl axiata, indosat and first media I use all of these providers, well it looks like all casinos will face the same thing as duelbits.
Hopefully duelbits can implement what you mentioned, because I also access others casinos via mirror link to solve this problem