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The battery idea is likely to protect against damaging the filaments (and power line RF noise). I've heard of people replacing the ballast with a SS regulator device to protect the filaments. There are also TVS diodes (AC version of a Zener diode), and if you put in one of the proper rating in parallel with the 1L6 filament it will still receive safe voltage even if something goes wrong enough to smoke other filaments in the string.
To read more about TVS diodes search 'Pilot TV-37 Transient Voltage Suppressor' they install them on the heaters of the rare CRTs in those sets to protect them.
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