Hello!
I'm a pastry chef from the States, and yes, at home we do have a ridiculous amount of different flours, but even in the bakeries and cafes I worked in we only ever had pastry flour and bread flour, and combined the two (worked out portions, etc) to come up with cake flour (the in between) when needed. I've baked plenty here with 0000, and it's a fine substitute for cake flour. Doña Clara is a great resource, tho.
Also, keep your eyes open, y'all, I'm gonna start marketing and selling my tasty treats! I'm thinking of having an open house taster thing to kick it all off (anyone interested?), I'll announce more when the time comes (I'm in the early planning stages, still... but I've gotta bake!). Along those lines, anyone know where I can get boxes to package stuff in? Cake boxes, etc?? I haven't checked Doña Clara yet, but didn't see anything like that in there last time I was there. I'm sure I could ask them, though...