xxtraloud

hello folks,
I am looking to get a OW from cph (or mxp) to sea, I can find the award available around the dates I want and with the fees it comes at around $50 on AA and $80 on UA. OW from europe to the US are quite expensive and since I don't know when I will return to europe I though to get a OW with my miles.

I will be based in SEA for a few years so I am trying to decide what's the best choice with the perspective of flying to australia/south america from SEA in the future with award miles. Also with AA it's possible to book one way to europe/south america off peak for only 20k, so it seems somewhat of a waste to use 30k on peak with AA.

Is there any way I can tack on a free one way to a OW with a stop over in my home airport? such as cph-sea-somewhere in a few months?

thanks