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Soft wheat flour is easy to find. It is available as cake flour in any grocery store.

Cake flour is low gluten, but also very fine milled. I don't know if that is a problem, but it might be!

It might be, BUT, there are also a large number of hits from places that seem like they should actually know what they're doing and test things.

biscuit cake flour

Seems plausible.

Go forth and report back!