Your challenge, should you accept it, is to make Switzerland abandon its neutrality and actively take part in an alliance, NATO for example. No POD before 1914 is allowed.
Lets see how you can crack 99 years of heavily armed neutrality.
Coming in for the spoils might as well be a - minor - option. Before WW I, many Swiss leaders expected a replay of 1870 - easy German victory. So, may be, some considered joining in when France is already down, and claim part of Savoy.. (some historic claims existed...). But this would only be a possibility if the hope that "the troops will be home by Christmas" are clearly coming true...