How would you go about the opposite scenario:

Got a status with OW through BA yet would like to credit flight to CX (while getting all the OW status perks...)?

Also, noticed that once signed into CX account, you could add other airlines' FF to your profile. Does anyone know whether that would suffice, and trigger CX to know of a BA/OW status, while booking the flight with them (and the CX FF#)?