I spent some time this weekend installing the EVGA 1080 Hybrid kit onto my Titan X P:
Temps Running folding @ home work unit:
I can confirm that the GPU block from the EVGA 1080 Hybrid kit works great for the Titan X P. You can use the existing Titan PCB heat spreader, and the EVGA block.
Unfortunately, you have to totally disassemble the card to get at the fan plug. Not too scary, just take your time.