Not sure if SIA would accept no bonding if you have the type but no time. Certainly no chance of a DEC.
We have some Captains (SIA Cargo) who were fairly high time 747-300 but they still had to accept the same bonding arrangements as the rest of us who had no previous 747 experience at all - and go through the full conversion.
That said, the market is slowly starting to favour the pilots, especially with the recent below inflation pay rise so it might be worth a go.
Bear in mind though, that after 5 years you are bond-free whereas if you pay for your rating elsewhere it is money spent that you will never see again.
I have to agree with your opinion (from a passenger point of view) of the Airline. The country also has much to attract an expatriate. Unfortunately, the high cost of housing and education, and the company's unwillingness to award inflation matching increases to either allowance is starting to affect operations.
The SIA Cargo rosters already have remarks on them referring to 'crew shortages.'