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Just off the 'phone to friends still working in Singapore and I would say your reasons for ALPA(S) wanting rid of the OSB pilots are well wide of the mark. It is a lot more to do with the almost total lack of quality of roster that has developed as the numbers in the OSB increased so that even in the good times the Singapore based pilots are left with a roster that has to be written around the OSB pilots roster, less monthly flying, (flying = money), more standby and therefore more roster instability and very little chance of being rostered a London flight, (and certainly not 'in-command' into London that would give a decent day off).
I can still remember the relatively happy days before any OSBs were opend and then it was possible to get a fair months flying and a good and varied roster. Before I left, when the base in London was still relatively small, the decline had started and from what I hear and see now the quality of life has deteriorated by a whole lot more.