I recently built and installed LineageOS on my FP2, works decent so far. Thanks to all contributors.
I just realized a feature I loved on the Fairphone OS that seems missing in Lineage: Mounting the SD card as USB Mass Storage to a computer.
I’m not an Android dev, but some digging around makes it look like 1) nobody believes this is possible, while 2) it’s perfectly possible and low-level implementation just waits for a userspace button.