If you are looking for an AD 65 person who wrote down the major tenents of dispensationalism in a systematic form, you will not find him. I can give you that point without issue ... but your conclusion erronously derived from that point is undemonstrable. I assume you are well aware that doctrine develops over time ... it took a few hundred years to formulate the doctrine of the trinity, and many other doctrines. Your own history of Catholic doctrine attests to this fact as well.
So your basic premise, that dispensationalism is false because no one wrote it down formally until the 19th century contains a logical fallacy. By that logic the doctrine of the trinity is false because it was not formalized until the councils.
Nevertheless, though I sincerely hope I am not wasting my time ... here is a summary article that you can easily read in one sitting.
http://www.pre-trib.org/data/pdf/Ice-AShortHistoryOfDispen.pdf
You will find other interesting articles (from my perspective) on that general site; including many articles that would be critical of your position. At least you would understand WHY we dispensationalists reject your view of theology.
i look forward researching your answer, 19 centuries is a long time.
Again, though that article is only a summary, you can look at the references that the summary uses to your hearts content.
lol ... Good luck with your research.
thank you for your thoughtful repsonse and the link.