Fiat currencies values will never go up 80%, that's just impossible and the governments won't allow it to happen either because that kills the economy as people would simply stop spending which would cause a deep recession.

The thing about large scale conflicts is that they are unpredictable and what they do to the world (including but not limited to Franc's value, Bitcoin's value, etc.) is also unpredictable.
There is simply no reason for Franc to be an exception and be "safe" while Europe as a whole would be falling apart in the scenario of a large scale conflict where one side is Russia and the other side is US and they are fighting each other inside Europe...