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Somewhat guided by gvdhoorn's answer I wrote the following shell wrapper around rosbag record.

unwanted_type=PointCloud2
unwanted_topics_as_regex_alternative=$(rostopic list --verbose | grep $unwanted_type | cut -d '[' -f 1 | cut -d '*' -f2- | sed -E 's/^ (.*) $/\1/g' | tr '\n' '|')
rosbag record -a -x "($unwanted_topics_as_regex_alternative)"

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