Secure person data by country

Content

We want to grant our 8 Heads of Country (HoC) data access to all employee's data records in the system who currently work in their location. Preferably, the data should be shown  (especially My Team, Absence Calendar dashboard and Compensation screens) as if being viewed by a line manager.

We're currently struggling with a couple of points:

1. Because of our setup, sometimes there is no direct link between the HoC and the employee as a manager type except for their location. Because of this, we cannot use the Secure by Manager Hierarchy option.
2. We've tried assigning a Country security profile with just their country in there and put 'View all persons', but this gives access to all person data (also outside the country).