If the Swiss got Nuclear weapon, they will use it only in Defense in case of Invasion or other threat.
but it will change the balance in Europe !
during the Swiss Nuclear program, Italy work on a nuclear missile program ALFA
http://www.astronautix.com/lvs/alfa.htm
Italy wanted under NATO Multilateral Nuclear Force (MLF) concept, equipped the ALFA with US nukes
with nuclear Swiss, the Italian government will insists on ALFA
also Yugoslavia and Romania work also on nuclear weapon program until 1970s
so in worst case scenario
In the 1980s will be nuclear weapons in Swiss, Italy and Yugoslavia...