Trading for Alpha with Izzy sounds good to me. If we trade with somebody else, chances are that she'll trade Currency for Aest with them to get it soon anyway. She's relatively small, so although she's ahead now, I don't think she'll be a danger tech-wise.
If we can follow up by trading Alpha to Monty for IW that'd be excellent.
I'd rather not trade for Sailing, Poly or Pottery for WFYABTA reasons. We could switch to Pottery right now, follow up with Poly and then go straight for Music. We could wait for a while with the Aest trade to give us more of a head start; as long as nobody else gets it there's little need to hurry.
I agree with settling E of sheep ASAP by whipping the settler. It will also close the passage through our borders after it gets its border pop. I don't think it's important to get the second GS quickly now.
Do we want to put the Corinth overflow into another settler? It has high food, great for settler production even if it's only size 2.