Indonesian Central Bank is only bluffing. They dislike Indonesian people holding currencies other than rupiah. They don't want us Indonesian people benefiting or being rich from bitcoin. We Indonesians will not subdue to these centralized & corrupt scumbags. I still hold my bitcoins and my other alts. I couldn't wait what they are going to do next week.
Cash in? Not hardly. Get a hardware wallet is what they need to be doing.
Just out of curiosity (and maybe ignorance), why a hardware wallet? Is that so you can keep sending/receiving (is a hardware wallet undetectable by ISPs and central authorities?)... as opposed to a paper wallet which might be useful to bury in the ground somewhere and create a treasure map to find it again.
Hardware wallet is to get your coins off the exchange. It makes them safe nobody can ever touch them. And it keeps the exchange honest.