Let me say I have a great deal of sympathy for your approach but ...
Who says they are "K" KPIs? I want to see some reasoning why these are the important ones.
That flag core list will play pretty much every week anyway if they are fit so it's not really a coaching progress meter. Maybe it measures the ability of our conditioning and medical team? Of more interest to me is how many games we get into the potential flag core: Bennell, Jetta, Gysberts, Blease, Strauss, Tapscott, Spencer, Cook, Howe, Maric etc - they're the guys we need to find out about. I reckon Jamar, Davey, Moloney and Sylvia are locks in the experienced camp and there's about 8-10 young players who are very likely - most of them in your flag core list, it's where the other 8-10 are coming from that I'm interested in.