hows this for a solution, approaching from south, on headings from 100deg, to 180 deg, call at 2rn, if from heading of 180 to 240, then call at what was YHOX, if from heading of 240 to 300, call at prospect, and if from LOE and northerly headings, then report at Parramatta..
it will reduce congestion at the 2 current points, and give ATC a chance to arrange seperation if aircraft ar on different tracks, eg a twin inbound at YHOX can be asked to speed up or an aircraft from 2rn can be asked to slow, etc etc..
just a suggestion.... (i wont hold my breath waiting for it to happen though)