It's not that the Ottomans would not want to support the anticolonial movements in Malaysia, it is that Malaysia's post-colonial government is too concerned over foreign influence of any kind to allow much of it. They see the Ottomans and the Chinese as equally welcome and equally problematic, try to maintain good relations with both, but prevent either from being too powerful. So they will use Ottoman influence to counterbalance Chinese, then Chinese to counterbalanbce Ottoman, then Australian and Indian to counter them both...
Can you clarify a little - unless you already did, and I missed it - just what Malaysia and Singapore's trajectory and status have been?
I suppose my sense has always been that a world where WW2 never happens slides the timelines there a generation to the right; if there is no Great War, either, then things get even fuzzier. Without the Soviet or Maoist experiments, I can't see a communist revolt happening, which creates some considerable butterflies all by itself; but this doesn't mean we would not see (as you seem to be implying, at least) some sort of glide path to greater self-governance, but with both polities still tied in formally to Empire/Commonwealth defence, with naval, air and ground forces stationed there in some significant way. It is hard to see Britain pulling back from "East of Suez" here, nor indeed that Singaporean and Malayan leaders would even *want* them to do so.
But, I am not to be writing your timeline here, Carlton!