An update: I was able to get Angkor Wat in my new game. I only researched techs necessary for getting to Commerce in order to grab it. Even doing that, there were other civs grabbing wonders near that tech progression which makes me think I probably only barely got it. The trade off is that I didn't get to Writing until much later than normal so my tech progression has certainly suffered. It may prove to be worth it, though. We'll have to see how strong the border pop synergies are. Despite being quite behind in tech I was still able to found 4 decent cities total and already forcefully annexed a nearby city state, so it seems like I should be in a good spot to recover in science and then see how the border blobs snowball works from there.