Battery Protection IC in Series
The Ricoh R5432V that you cite has an example on page 35 of two devices series chained to provide 7 cell protection. The method shown could be extended to more than two ICs. 

The single IC ccts on pages 32 33 34 look relatively self contained so a series could stand on top of each other - but need redundant external FETs per cct group. The cct on p35 shows how to combine them in one case. 

The TI BQ2947 is only an over-voltage protector. The simplified cct on page 1 is very standalone except for the single fuse blowing MOSFET. (This could instead be a "charge disable" function.)  That feature could be extended to a group of series cct with a diode OR gate - each cct uses a diode and resistor to pull down the FET gate when active.

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Overcharge protection per cell in a series string is "easy enough" as the voltage of each cell can be monitored and steps taken to remove charging current on a per cell basis. 

Overdischarge per cell is hard as if you removed a cell from a series string (which takes two FETs typically ) the string voltage drops and so this is not suited to a parallel string arrangement. 

What you can do is 


Stop discharging overall if any cell is dangerously low or send a warning if any cell is approaching a critical point. 
Unusual (probably) - remove the string with the low voltage cell in it. Strings which have cells all above the limit will continue to discharge until each in turn 'drops out'. The maximium discharge capacity of the battery will also drop as strings are removed.