[Voodoo Rufus]

Good idea.

As far as the block is concerned the CPU is simply a heat source. So eliminating the TIM joint from the testing process will increase repeatability even more. Simulating different die sizes by altering the focus should not be difficult in principle as well. If a laser is not readily available, there are other heat sources (electric heaters on a lens?) that may fit the bill, or warrant looking into at least.