Print the stl file attached to this project.

connect the wires of the display cable to the orange pi zero 2w according to the table above, you will have to remove the female pin attachments of the display cable if you're going for the soldering option

Flash the minimal armbian with the link further above onto a micro SD card with minimum 8GB storage, insert it into the orange pi zero 2w and connect the display cable to the eink display. Boot it and see if the screen refreshes. At this point you can connect a keyboard and test if you can type.

Disconnect the display cable from the screen, screw in the pi to the case, for that put nuts on the other side and hold them while you put in the screws. Then reattach the screen to the display cable. Attach the screen via screws and nuts to the case,

Enjoy writing anywhere, get a small portable keyboard with usb-c for this and use the bluetooth file server if you'd like to recover your work from the pi.