Yes, one-way rewards are available, but pose a different problem. If I book a one-way from YVR->MLE (or the reverse), then booking a one-way to Europe becomes incredibly expensive. Is there any way to do a reward on the return, and a one-way on the outbound but at a reasonable price?

I tried a few things, and shifting the dates so that MLE is at the end of the trip, and returning via Asia, appears to work OK. Can do MLE->SIN->ICN->YVR in SQ J and AC PY for 75k miles plus a little taxes (200$ each).

I would still need to book YVR->Europe, and Europe->MLE.