If your Dad owns the jet, sure you will get a right seat with 250 TT easy.
In reality , in HK/Macau you need at least 2000 TT with 500 jet, and there's plenty of guys applying with type rating.
In Thailand you will need 500 on type for a biz jet right seat.
Indonesia, the locals tend to get the right seat jobs, plenty of guys in Garuda / Lionair, want the well paid corporate jobs.
For the above mentioned the conversion depends on your experience , with a ATPL , you are looking at Air law, Human factors, type technical and a perf exam.
Now plenty of guys /gals want to leave airlines and go corporate, so I hate to say it but your chances are pretty slim.....but I have been wrong before.