Temporary columns - When I occasionally want to do something like this, I create Reading Lists. Reading lists don't need extra columns and they don't create tag browser clutter.
I name them !whatever so they appear at top of the lists of reading lists - they don't auto delete at end of session but the ! enables me to remove them manually as and when...
Maybe the RL PI could be enhanced to implement temporary reading lists that are removed at end of session, although I sometimes find I keep the !whatever lists for a couple of days.
BR
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