An unofficial Nougat build exists, and an update will come in the month.
An unofficial build on Pie should also come in less than 2 months (if the sources of the lineageos build you refer to are working).
The ultimate goal is to fulfill every new device request in less than 3 days by the creation of an unofficial /e/ build (I hope it will start at the end of the year) when an unofficial LineageOS exists, and update all the unofficial builds at least once every 3 months.
This way /e/ would have hundreds of compatible devices with always updated builds.