They have to do that quite often anyway - as soon as you take 2 or more horses to the races. I wish someone thought about horse welfare (let alone the connections'!) when we took two to Kilmore in winter. One in the race 1, the other in the last 3.5 hours later!!!! We sat at the stalls (can't leave the horses unattended!) and ran with them in the parade ring every now and again. +4, rain and wind. Never again...
Horses stand most of the day anyway (and what's keeping the stable staff from walking them around?). If we are serious about improving the integrity, then let's get serious! Getting them to the track early is cheaper than providing security to all the stables.