To get things going quickly, I've decided to create REBASE within two months. The goal is to release a first version by the end of January 2020.
I still needed to see if people would by the product, even if it didn't exist yet, so I've launched a page on Gumroad to start the pre-sale:
On the 2nd of December, the day of the launch I've already sold 17 copies of the book.
Given that I haven't even started writing the book yet, this was a very nice motivator to get started.