Although some don't like him Bruce McAvaney is the human encyclopaedia on sport and I am sure still takes an interest in the trots. When I worked at HRW we posted him a copy each week so am sure he would still be across the sport and would be an ideal "anchor"
A guy like Terry McAulliffe has also "crossed over" to the general network coverage of sport by way of calling athletics on TV, as has Peter Donegan, and both are racing men at heart.
Dan Mielicki too of course worked for the 10 network as a sports reporter for several years so the point is there are plenty of talented professionals to choose from who have a walk up start of the nuts and bolts of our sport!