There are alternatives to CND filters. One is simply to average-out the light fall-off. Specifically, a wide lens loses light away from the center to the edge. The center will be correctly exposed. Let's suppose your lens has a 1.5f fall-off from center to edge. Just over-expose the film by 0.75f. That way the center will be over-exposed by 0.75f, and the edges will be under-exposed by 0.75f (instead of 1.5f) -- but the rest of the image will be closer to the correct exposure. Overall, the image might meet your needs, especially if you dodge the center of the print.
Here are some other ideas:
http://www.subclub.org/fujinon/center7.htm
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