Tiger are trying to get pilots from Mandela but are having difficulties with licence conversion. Most of the first batch failed Air Law and now there is a requirement to have a pass in Human Factors/Human Performance and Limitations as well. Singapore use the JAA exam and it's not easy, especially with a Level 4 English standard.
Nobody flies Singapore registered aircraft without the proper licence. CAAS quite rightly insist on a strict conversion procedure and won't rubber stamp a bunch of dodgy tickets in return for a couple of thousand dollars under the table.
Indonesian pilots flying for Tiger Australia ? They'd need CASA licences, and work permits. You'd have more chance of getting a departure off runway 16 at YSSY during peak hours when 34 is in use.