I agree it does sound like an exercise in liability management. I don't know how over-engineered the Herald rack is.
I've used the Rimmer rack without problem, but generally on smoother single-venue tarmac. Something like the Tour of Mull might be a different thing. Actually come to think of it I had to replace it after one of my bigger shunts at Chatsworth, but I had to replace my (standard) RS2000 rack after a lesser incident.
If an escort rack has suitable dimensions that fits and doesn't involve creating bumpsteer, then they are a tried and tested item.