The CFA is a real commitment so don’t do it unless you are really interested in it.
If you want to focus on poli sci or policy, why not see if you could change jobs now- before taking on the expense of grad school? Think tanks need finance people. Your state government, Department of Education, lobbying organizations, global relief organizations, International development funds need finance people.
Just launch a job search for something where the content is closer to what you want to be doing… if you love it, then terrific. But if you find the policy/development/international relations piece boring, you’ve saved yourself two years of grad school…