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Maybe you can interleave your 7000 throughout the story by making it a perfectly "parallel" (separated) chain of mini-chapters which are a kind of preface for each chapter of your real timeline. A...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/33266 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Maybe you _can_ interleave your 7000 throughout the story by making it a perfectly "parallel" (separated) chain of mini-chapters which are a kind of preface for each chapter of your real timeline. As you wish to avoid spoilers, make it so that it is simply unclear that the mini-chapters are the solution to the main story. Let the reader in the dark as to what your mini-chapters are actually about. Skip mentioning names, use different names, whatever. At the end, with your great twist, maybe the reader will go back and read the mini-chapters again, now with the complete knowledge, and have many small "a-ha" moments. I've seen several books where this has been done (not usually with a great twist, more a gradual enlightenment; but I can see it work if you get the twist just right).