You do what other sports do. You invite junior players - all junior players, not just the ones in rep teams to skills based academy sessions. Everyone gets the opportunity to have some sort of advanced skill development delivered by someone other than a dad doing his best. Because it's not a rep team environment and there's no pressure to win and no shennanigans re selections, the sessions are skills based and not based on winning games. Identified talent can be invited to additional sessions if neededafter the whole thing has finished.
It's the sort of thing the Swans do, hockey does, water polo does and a range of other sports do as well.
Why the NRC - because it's largely free of the parochialism of the clubs, but it's close enough to the grass roots to still be local. It also gives these NRC clubs a stake in developing a region and gives the kids a real experience of their NRC club.
From my observations of my own kids playing different sports and also talking to other parents, rugby has more levels of junior rep stuff than just about any sport going around. In Sydney for example (with a declining junior base I might add), we have district rep teams from 10s to 17s, zone reps from 14-17s, Sydney reps and then a NSW team. These kids also play junior village competitions at the same time. So they get a village club coach for the season (sometimes a dad doing his best) and the better ones get various rep coaches for sometimes 2 or 3 weeks - all concurrenlty. (I'd put a broom through the lot of this stuff and have the kids playing village rugby uninterupted all season and play one level of rep stuff after the finals)
The vast majority of kids get nothing - many just give it away as they get pigeon-holed at 10 or 11 as not being up to it and never really looked at again, the ones who stay on aren't really developed as well as they might. And we all know that many kids are late bloomers - the naturally gifted 10 or 11 year old who wins the school swimming and athletics carnivals and is the best at every sport he/she tries aren't always the best at 18.