I personally know of one cadet of Sri Lankan citizenship, holding Singapore
PR after working under local company for a while. applied for cadet pilot program and currently in training.
hear-say, he is not the first to have taken this route, but to what i understand (dont quote me) is that most of them went through some sort of tertiary education here in Singapore.
i guess its a long shot but if you are still young, i'ld say go for it! nothing to loose.
i personally admire your drive. keep it up.