Yes, this is easy to do in Quizmaker. First, you're right to set up the final question feedback to "Finish Quiz." But what you also need to do is close out of Quizmaker and open PowerPoint. On the slide where you have your last two path quizzes, click the Properties button on each of the quiz slides.
From there you can specify where the learner goes after they complete each quiz.
So, in your example, each of your path quiz slides will branch to your final slide with final quiz.
I hope that helps but please let us know if you still have questions.