By trying with various Momondo sites (different countries seemed to give me slightly different variations), managed to book ICN-LHR-MAD-LIM-SCL-AKL-SYD-TYO and SYD-AKL-SCL-GYE-UIO-LIM-MAD-LHR-SIN-TYO all on OW carriers. Had to play around with dates quite a bit though to get the pricing I wanted and to make sure the LIM-MAD sectors weren't on IB metal so it would credit to AS.