BCA do ask for a kitas. I find them pretty good - at least they have internet banking! and most businesses seem to have BCA accounts, so I can pay by direct transfer when doing business.
If it's only for 6 months maybe you could set up something with your own bank - they could have a relationship with a bank in Indonesia where you can access your $$.
of course there is always ATMS to access your funds from your own bank, but you probably know that
