That is probably what the French monarchy were thinking when they got France involved in the American Revolutionary War. Then the French revolution happened, the elimination of the French aristocracy, the dictator Napoleon rose to power, and then a European-wide war.
When wars start nobody knows where they will end. I find your assurances and platitudes puerile, disingenuous, and ignorant of history.
I find your ignorance of the history of previous proxy wars appalling.