Please check the first post, I've added a link to a folder containing snapshots of my development. It still lacks two pieces: development VM and snapshots of raw EMMC images.
I am aware that this looks a little messy, sorry about that. Once everything is in place I will invest some time to clean this up and prepare something more straightforward.
Honestly, I need to wrap my head around this as I already forgot how the entire thing was assembled.
If you have any questions, please do not hesitate to ask.