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I'm sure a catalytic coating might help an immeasurable amount for a while. It would coke up with soot after a while and reduce its effectiveness. Diesel Particulate filters compensate for this with much more surface area and prolonged heat exposure (and they still get plugged). A piston gets hit with rapid hot and cold cycles.
If I were going to do something with the precups it would be a ceramic coating. This has been shown to be effective. Though unlikely if it is done right, the only downside is it may crack or come loose which can lead to engine damage. Auto makers were seriously looking at ceramic coatings until NOX emission regs got tougher to meet.
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