You could make a Sub-query that is a UNION to the top level. And just make each field of the sub-query be a calc field (in the same order and type as the top level query). Make the calc fileds be static values. Then in the RDL,hide any row that matches the static text.
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Make sure the static values you use in the sub query don’t get caught by filters of the BAQ report. This might be tricky if your BAQ Report uses a Date or date range as the filter.