Once you reduce power for a descent, the CHTs will be below 380 so it becomes a non-issue. The idea that pulling power just before landing will damage the engine has no basis in fact.
Exactly.
Gradual reduction in power from cruise to landing following the engine manufacturers operating procedures is what protects the engine from shock cooling.
P.S. :
Somewhere in my stuff I have the pilot operating manual for the C117 and there is a caution there about rapid cooling causing cylinder choking, however by following the power reduction procedures there is no fear of shock cooling when you reduce power to zero when landing....I generally reduced power to zero about fifty feet above the runway in the C117.