The SSD did arrive and it’s the right size and everything! So anyone looking to save a bunch of $$$ head right down to the link in the post.
I migrated my Arch installation with rsync with success. I did have an issue with the WiFi throwing errors like below in the kernel log and not connecting to any APs:
iwlwifi 0000:01:00.0: WRT: Failed to set DRAM buffer for alloc id 1, ret=-1
The workaround to use firmware version 63 fixed the issue.
The only major issue I have is the my LG Ultrafine 5K display not working over Thunderbolt. Will open a new issue for this.
EDIT: Turns out the long Thunderbolt cable was to blame. Used a 60cm long one and it’s working smoothly and with no issues so far.
EDIT: Nope, even with a shorter cable, it only works sometimes. And the longer I use it, the less reliable it gets. I have now given up on the 5K display for now. I’m hoping this is a firmware issue on the Framework side and not a general Linux shortcoming.
EDIT: My issues with 5K screen seems to be limited to Linux. Windows 10 works perfectly.
EDIT: Yet another issue with the screen is super slow charging speed — e.g. 10 hours+ to go from 50% to 80%.