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There's going to be a diminishing rate of return as you frame up the pastel ever more creatively to try to avoid the problem. With the double mat you're providing twice the "shelf" for pastel particles to land on, and, sure, you could put a thin spacer (perhaps even the thickness of illustration board) between the mats, but that's going to have its own visual and aesthetic effect. In addition, you'll run into problems exceeding the depth of the frame moulding rabbet, with glass, two mats, two spacers, artwork, backing board, and whatever else.
If you can't gently tap the particles loose from the lower mat, to fall down in behind the glass, and if you really can't abide leaving them in sight, I don't know that there's anything left but to dismantle the package and blow the particles off. (Careful about rubbing -- it's still pigment, after all, and can "paint" your mat bevel. Then you are in a fix.)
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