Just put the Reds and Tahs in the national comp instead of having (yet another) tier. Those teams aren't beating the Brumbies at the moment; and when they do, that's great. It doesn't stop, say, a Western Sydney team entering the competition (the hurdle there is that NSW Rugby are overstretched for reddies - such a team would need wealthy backing + independence, i.e. alongside Sydney Rugby instead of under it). If you want to have an all-of-NSW rep or origin team (or all-of-Qld) then save it for something like a Lions tour which is the closest thing left at top level to the old-style representive rugby from last century. TBF, such an origin team in one or two annual games would not likely be much better on-field than the regular Tahs side due to lack of team cohesion.