Lambs: +2 food
As for wonders, the rule is that if you
own wonders with your civ's traits when you
build any wonder you will trigger your GA. You can conquer wonders to satisfy one or both of the traits requirement. We could, for example, conquer the Gardens and then build Copernicus. Or conquer both and then build something else. Or build them both. We are not likely to conquer any wonders in this variant so, if we want a GA, we will have to build them.
Here is the complete list (I looked it up):
Expansionist: SETI, Lighthouse, Colossus, Copernicus, Magellan's
Industrious: Great Wall, Gardens, Pyramids, Hoover, Manhattan
The choices appear to be:
Colossus-Gardens. Well-timed and both wonders are useful. I am reluctant to devote early shields to a wonder (Colossus) though. Furthermore Monarchy is a useless tech, although we could certainly trade for it. If we try this route, the plains square is clearly the best.
Gardens-Copernicus. A bit late but not tooo much and both wonders are useful.
Copernicus-Hoover. Clearly late but we should have no trouble achieving it and it will be useful for that last burst of speed towards flight and ...

.
A final choice would be to build the Colossus, hoping to get the Gardens. If we fail on the Gardens, that makes just one more reason to make sure we get Hoover's.
I suggest trying an attempt at HG-Nic if the opportunity arises to build the Gardens. If we don't manage this, we should absolutely make sure to get Nic-Hoover.
Edit: in either the Colossus-Gardens or Gardens-Nic variants, the GW is a decent backup if we fail to get the Gardens. It is even more useless than ever in this variant but that's beside the point.