I'm also looking for a host that will take 3+ P60 modules.
So far I had no luck, so the next step will be to get a triangular metal plate and drill three large holes in it. I will then put a single P60 host through each hole (probably 3 solarforce 18650 hosts), with the head on one side and the body on the other side. The P60 modules will be XM-L2's, which are just awsome.
This will give me an upgradeable, portable floodlight with 3000+ lumens for about $100. The only drawback will be having to turn on 3 switches.
Pity no one is making a TK45-type triple P60 host with 3x 18650s. It would be a winner.