In case anyone is ever looking for this answer, here is what I got back from Support:
"The Override Currency Cost Rate field in Job Roles does not populate when importing data via Kickstart. This behavior is due to how Workfront's data architecture handles currency and cost rate overrides. The Override Currency Cost Rate is not a direct attribute of the Job Role (ROLE). Because of this, the Override Currency field will not automatically populate during a Kickstart import. Therefore, while the override cost per hour may show in some views or reports, it will not appear on the Job Role detail page."
In testing I can get what I need from Reporting, Views, and the value does calculate on projects - it is just not visible when you click into a Job Role.