Hey, thanks for reading it all.
Well, i think it would be most beneficial for NZ managers because of the Merch bump you get with homegrown NT players. It certainly doesn't have to be exclusive NZ managers, but i'm not sure other managers would be as invested. I'm certainly up for training one myself.
In practice i probably only need 4 managers, 2 for each build to get the benefit to the NT.
As far as communication, most NT teams/countries have an offsite forum to organise and put scouting info.
It would be a challenge for sure. But why not try? Even if no one wants to do the training plans, i'm confident i can eek out some improvement with everything i've learned over 20+ season for some improved results.