Hi I'm currently based in YVR but that will change come May, moving back to OSL for a year with gf from SEA. Might move back to either Canada or USA in a couple years.
I'm a 55K+ BD Gold and don't see why I wouldn't remain with BD, but as for gf there are a couple scenarios possible:
She is currently CO Silver, but that will lapse after the year end, but not sure exactly what date. Likely she will go for *Gold next year.
1: Go for CO Gold, since I often fly CO, then if we fly together she could possibly get the comp-up plus companion comp-up (very often open seats on IAH-YVR). Chance of 2xEQM.
2: Go for UA 1P, somewhat more inconvenient as UA don't fly to OSL. Has the benefit of obtaining EQM from credit card, but 1P comes after gold on CO upgrade list which is terrible. Chance of 2xEQM.
3: Go for BD Gold, I can buy her BD*S and she would need 38K to get *G. No chance of 2xEQM.
4: Ditch status and use miles for travel.

Likely flying some intra europe, a few OSL-EWR-SEA or similar and maybe a couple SEA-Florida runs early next year.