I just looked under the "FAQ" section of the filter's website and found this:
"The KLR Filter is designed to remove particles down to 1 micron from home brews. Most yeast cells are 1 to 2 microns in thickness, and larger particles are easily filtered using the KLR Filter system."
So I suppose the smallest filter would still let enough yeast into the bottle for conditioning. But I haven't seen any reviews on it so I guess the only way to know would be to try the filter. $55 dollars plus shipping is pretty steep for me though.
My current schedule is:
3 week primary
1 week cold crash in primary
Siphon to secondary
1 week cold crash secondary
Haven't tried Irish moss or Whirlfloc yet.