Howdy y'all first off thanks @NeverDie for this thread, I spent a good time lurking at these NRF52 posts and learned and re-learned a few things here and there.
I've built an E73 NRF52832 PCB and successfully did a blink using Espruino and Adafruit's Bluefruit FW for Arduino and just noticed the $10 CAD E73-2G4M08S1C (NRF52840) back in-stock (as of October 8). I am in the process of designing a pcb board layout for it but in the meantime thought that the community might find the following useful if you plan on designing/using these modules:
E73-2G4M08S1C and other footprints in the same 'family' are readily available in Altium Designer format here: http://www.cdebyte.com/en/data-download.aspx?id=356&pid=202
Library.io allows you to convert '.pcblib' / altium files to an Eagle Library format, you just need to specify the Symbol and Package, from here you can convert to KiCad or similar I'd reckon but have not used KiCad enough to verify this. This saved me a lot of time.
In case someone was wondering: I've had no issues using the J-Link Edu Mini with the NRF52832, will update here when I get to the NRF52840.
Just starting my own NRF journey and thought to add this here in case someone is looking for E73 module specifics WRT NRF52832/NRF52840 .