You'll have better luck at getting responses if you post your profile using the standard format.
Nonetheless, coming from a math/stats background is not that uncommon, given how a sizeable portion of serious applicants are math and econ double majors.
What programmes have you looked at that require at least a minor's worth of econ? The good ones only require you to come from a quantitative background. Also, public policy is very interdisciplinary. You can pursue a PhD in Public Policy without going through the Econ route, which is arguably more competitive since mainstream Econ applicants with interests in applied micro usually apply to econ-focused PPol PhD programmes as well.