EDIT: A little curious, what kind of currency you will pay
You must not have heard of cash deposit machines (and it's a method already suggested above). They're like ATMs (or some even have an ATM function). You deposit cash into any account you want, it doesn't even ask for registration, (it does have a cam though) and there are high limits. Very, very popular in cash-heavy Southeast Asia, definitely in Indonesia where OP's asking.
The voucher system mentioned above is also pretty popular in SEA.
Both methods were very popular on Localbitcoins until they were removed a few months back. Traders are still offering/doing it though...