What Avalon needs are is a transit lane to the north and a transit lane to the south, keeping the lighties clear of the approaches and circuit area.
The most difficult thing about Avalon is not other practise IFR aircraft, but the fact that we have multiple bogies from multiple directions doing a vast array of different things but mostly transitting.
Make the airspace Glass C, the ground class G and provide lanes of entry. I view Avalon as workable, but inherently his risk, like Broome, but Broome just does not have the transitting aircraft.