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Hard anodizing the heat spreader seems like a great idea for electrical isolation. The only thing I would worry about would be the degradation of thermal conductivity. I get what you're saying about the layer being very thin Camlight, but it might be nice to have some numbers. Type III anodizing is used in industry to provide a thermal barrier in addition to an electrical barrier in some applications (which makes sense since thermal and electrical conductivity are generally directly correlated in metals). For example, part of the reason pistons in ICE engines are hard anodized is to reduce the thermal conductivity of the piston and therefore mitigate thermal expansion allowing for tighter tolerances....
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