gums:
The engineering task force certainly will provide options to the high rocks of the involved players: Yuasa, Thales and Boeing. From an strategical POV the issue deserve a strong and clear response. The change of the battery type has this "feature".
But there are chances the problem is simpler. I personnaly would bet in how the wonderful and critical batteries are being "managed". The engineers will have this info if not yet and in a scenario of this type the not trivial retrofit could be not necessary.
Another alternative (not immediate to introduce) would be have two options of batteries and associated devices. This would not be "free". There are reasons they specified the Li Ion as main and APU batteries.
I question why they not used two as main. With different "regimes" could be nice. In R&D we brainstorm continuously.
We went thru this 40 years ago with the power supply system for the Viper.
I can imagine how the problem was handled by the people involved.
Regards,
PS
My son (copilot during the RTW flight) made his first solo by December 16.