The basic setup:
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Layer #1: Save file
Layer #2: Ram disk
Layer #3: Added SFSs
Layer #4: Boot SFS
It`s another level of complexity that arguably isn`t needed, but it keeps the Save file clean...
Copying config. files and making links is then done through the ram disk`s mount point, not /.
I don`t like having a union at all, so this isn`t my preferred way of doing no-union SFS files.