Like Jimshaw, I use the MSR aluminum windscreen with my Snow Peak Giga stove. I have trimmed it a bit and use it loosely around the stove to minimize any potential heat buildup. It is placed nearest the stove and pot on the windward side and is never used to tightly enclose the stove.

But, I also have made a small circular heat reflector that fits between the canister and the stove. It is just a piece of aluminum flashing about 4" in diameter with a 1" hole in the center. It goes into place when I screw the stove to the canister and serves to shield the canister from the hot part of the stove.

I keep pretty close tabs on the canister temperature when I am using the wind shield setup and I have never had it get warmer than body temperature when the reflector was in place.