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When I drilled out my defouler for my race header I left the small opening on both my deoulers. I stopped drilling about 1 or 2 mm before the bit went through so there is plenty of room for the O2 sensor to fit but the hole at the base is the original size. I wanted to make SURE I wasn't going to get a CEL by doing this and it worked great.
Your theory is good. You can use just one by doing this. All you have to do is stop drilling right before you're about to get through the other side. I used a bench vise to keep the defouler from moving while I did it.
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