Thats why i posted a picture. If you can give me a picture of your setup I'm sure I can make something that will fit.The main problem with doing it the way you pictured is that I can't put the LED on my test jig to get the beam profile.
I think i may not have been clear enough. My intent was that you still use your heatsink. I would not classify what I'm trying to do with the heatpipe as a "heatsink" per se. Consider it as a heatspreader which would still be in need of a good heatsink.The heat pipe won't make the heat sink "better".
I have the utmost respect for your knowledge and methods but I have to disagree very strongly on this point. As our old buddy Newbie has on his site(and here too I'm sure) many heatpipes have thermal resistances 2,000 times lower than copper and 4,000 times lower than aluminum. When you consider that the vast majority of heat coming from the LED die is concentrated in a very small spot and is not significantly spread by the ceramic substrate thermal resistance(and the need for a heat-spreader) becomes a very big deal. Heatpipes are in an entirely different league when it comes to spreading heat.In fact, the heat pipe will add a small amount of thermal resistance into the equation as opposed to just mounting the LED on the heat sink as I always do.
Love your "freezerator"! I can not imagine how many hours went into that. What do you use it for?