Basics:
- Option for creating multiple profiles/users
- If more than one is configured, pick profile when device wakes up / it turned on
- Do bind mounts for user specific saved state / settings directories.
Optional:
Motivation:
Prevent that my kids and partner overwrite my saved states and I theirs 
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Yep! Great minds. 
This is actually one of the things on my very large todo list. However albeit slightly different, but similar to your idea.
My idea stems from setting up a partitioned SD2 card on-device. Booting will detect this and allow profile selection. There is a lot more to this of course, but canโt let the olโ bag of tricks be opened up just yet.
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As long as ROMs are on their own partition, that sounds very promising! 
That would be part in parcel of the separate user partitions on SD2. You would place your content on SD1 that youโd want everyone to access then place content that only you would want access to on your specific SD2 user partition.
Clear as mud 
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