[adciv]

(Computer engineer here) Looking at your design, there's two things that come to mind.
1) Could you design it in two parts that are then screwed together? This would allow you to add it to a compressor without removing the head. (This appears to be required under the design)

2) I think your fins are thicker than they need to be for cooling. Are they there for mechanical support or manufacturability? I'm trying to compare them to higher end computer CPU coolers which use thin copper plate.