Bibor
Doomsday Machine
This might require early alphabet to get any tech trades here. Not sure how early on you are talking about tech trades.
Not sure if Emperor AI has anything meaningful for trade this early, at least that's my experience. They usually rack up on religious techs and monarchy, which is "meh" on this map. I opted to go Currency instead. Besides, if nobody has Alpha, they can't demand techs, just resources