ERM, you would find it very hard to get anything sanctioned from the RFL with regards to residential trials in the UK.
Although some don't like it there are mechanisms for this age banding which is just about to hit the streets and will be known as the Lionhearts & Lions Program, not to be confused with the old Lionhearts.
Once you have completed your trials you will no doubt find the majority of lads have either not succeeded and been released by Super league or you get that one genuine stand out player and to be fair the Three counties does that every year and the three counties will be expanding in the next 12 months and again in 24 months. its taken time to get there but its on the go!! The counties series will run in hand with the Lionhearts
Now I agree talent and drop off at 16+ is massive in Rugby League but its no different to any other main stream sport. The focus for me is you have to build a bigger base at the bottom to make sure you can sustain a viable competition come 16 and over.
Your going into a market that will shortly have a dedicated team looking after it but I would be interested to hear your vision?