As a country manager, you will never coach every rep. There are too many of them and too few of you.
But you can coach the people who coach them.
In my experience, the quality of coaching in the field is set one level up. If the managers are growing, the reps grow. If the managers are only reporting, the reps are only reported on.
So I work on my second line in four steps.
Agree one gap each. Not a list of ten. The one development need that matters most, chosen with the manager, not handed to them.
Coach the coaches. Join their double visits, and watch them, not the rep. How do they debrief? Do they ask or tell? Do they fix one thing, or everything? My feedback afterwards is on their coaching, not on the rep's call.
Give them real decisions. A hire, a project, a part of the budget. Managers grow by deciding, not by attending another workshop.
Review growth, not only results. Every quarter, I ask each manager how their people have improved. Their result includes the people they developed.
None of this is complicated. It just has to be on the calendar, or it disappears behind the monthly numbers.
“Your reps grow at the speed your managers grow.”

Lesson 10 of 17 in Step 5: Building the organisation, with the full guide and a checklist for this week.