The question says everything really - is it possible to schedule a Pod based on the namespace it is assigned to?
It's not built in as far as I know, but there's a couple of ways you could do it:
Create a mutating webhook that modifies the pod affinity rules if the namespace == something. Using something like this: https://github.com/slok/kubewebhook
Using the PodNodeSelector admission controller: https://kubernetes.io/docs/reference/access-authn-authz/admission-controllers/
Using the PodPreset admission controller: https://kubernetes.io/docs/tasks/inject-data-application/podpreset/