I think I may have found another option: the NTS0104. It's only 4 channels, but it looks very similar to the TXS0108E, and the smallest package is ~1/4 the size of the smallest TXS0108E. It might not save too much space, since you're splitting one IC into two, but it looks like another reasonable option. The maximum speed is 50Mbps, which is cutting it close, but it is within spec.
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