Have you actively sought them? No one has given me a scuba diving instructor course, but if I asked around then maybe someone might offer me one. 15 hours is a lot. PE / Games is about going out and developing it yourself. For someone paid 25K+ a year spending one hour of your time at a coaching centre observing good practice shouldn't be too difficult. Timetables shouldn't change. You just confuse the poor kids. Special events yes, but there should be a sold structure in place.