I'm posting a partial report as I have some questions.
preturn: nothing to change. IBT a Zulu longbow comes out of Bapedi and kills someone in the fog. Lots of Viking units move toward Zulu.
(1)360AD: We kill two impi and capture Bapedi. Two resistors. One knight retreats but the other kills pike and we capture Isipezi. We have saltpeter now.
IBT Vikings retreat? Zulu and Netherlands make peace.
(2)370AD: Bapedi flips back to Zulu.

We lost two knights.
(3)380AD: we kill a musket and capture back Bapedi.
(4)390AD: nothing.
IBT Netherlands declare on Vikings.

Carthage wants to exchange TM and I decline.
(5)400AD: we give 24g to Netherlands.
11gpt+92g to renew lux deal with America.
(6)410AD: America declares on Vikings.

Aztecs start Copernicus.
(7)420AD: Aztec doesn't have Banking or Military Tradition, but it doesn't know America.

We have 7 turns left for Astronomy.
Now come the questions.
1. We can buy Astronomy by 37gpt from Aztecs, trade for Banking or Military Tradition and hopefully get our money back by trading back to Aztecs.
The problem is that I do not know for sure if this falls into "half price" since Greebley didn't tell the number of beakers needed when he started the research. Also, as more and more AI know about it the price has been constantly declining, so the whole method isn't accurate. I'm a bit lost here. But given the turns we've researched, and the gpt we paid for Education, I think it's over half now. [on the other hand, self-research would cost 7 turns with 68 beakers/turn, seems cheaper than buying.]
I hope we can make the trade as that allows us to trigger our GA.
And if we trade, I guess we should be able to get both Banking+Military Tradition from America by our only iron plus Astronomy.
2. I haven't founded the ivory town as it's too flip risky and irritating to the AI. I might try to raze the wines city and replace it there.