No Indonesian invasion of East Timor 1975

Was there any way that East Timor could've not been invaded by Indonesia in 1975 ? How could the US and Australian political influence on Jakarta to invade ET and neutralise the leftist FRETILIN govt, have been negated ? Could there have been some other option after Portugal relinquished control of her Pacific colony, such as being administered as a UN Trust Territory until deemed sufficiently pol and eco developed to become independent as a neutral-aligned nation-state during the Cold War ?
 
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