This is very much a gray area right now. CO's official stance is that Asian reward destinations east of India require a TPAC routing. In reality, however, it seems that some folks have been successful in redeeming for European carriers to SE Asia. Where it gets tricky is with the onward connections. Getting to SIN or BKK on LH or TK seems to not be an issue. Getting past there by adding SQ or TG in seems to cause problems.
This is all anecdotal so the best bet is to try calling it in if you see the inventory and hope that it tickets. If not you probably don't hae too much of a leg to stand on in protest but if it does you win.
Good Luck!