Lawyers in Singapore are paid on average a fraction of some of their other Asian counterparts. That shouldn't stop you from doing a law degree and becoming a lawyer first. You can save a bit of money and get an instructor's rating to build hours by instructing part-time at weekends. After about 5 years and 1000 hours later, you may be considered for direct entry into the airlines.
Alternatively, forget about uni and spend a similar amount of money on Jetstar's Pilot Cadet Program:
Careers | Jetstar
Do not go for Lasik unless you have discussed it with CAAS DGCA.
What can I do with an aviation degree should I be not successful in being a pilot?
Nothing. Complete write off.