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There's a link in this thread Good tasting "Crust" for Rhubarb Pie? to a site that has a low-carb pie crust that includes cream cheese. There's a bit of whole wheat flour in it so it depends on what your low-carbing boundaries are in regards to using the recipe or not.
sounds like plenty of people on the forum like to use soy flour flax and almond flour to substitute. I think there is no clear answer except for you to buy all three (maybe even some WHole Wheat Flour) and try a few combinations. In the end if you are making a double crust pie and need to stay away from a few extra carbs just take the top crust off.
MYself... I've tried soy flour but I didn't like the taste. going to try the expensive "BakingMix" Atkins Brand for $11-13 and see if it's worth it.
I've also purchased a 1g carb pie crust mix from GNC. I'll report back with the results.