I have been considering this, and see no way forward until the file system is UNlocked. Even to remake the keyfile one must have access to the file system.
It is past my witching hour, and I am retiring for this session. Will have it on mind and take it back up in my AM.
It can be hoped between now and then some others with the experience will chime in here and offer some guidance.
when you do not see how
take a break