Alaska, British Airways, Cathay (Asia Miles), Finnair, Ibera and Qatar are your only options
Each will earn 25% of miles traveled except Finnair (it's 50%) and Asia Miles (it's range based eg a distance of 5000-7500 earns 3300 miles )
You should be able to show your Gold card to get into lounges but otherwise I'd forego the points and take the lounge access instead (might even be able to do a retro claim later).