Additional Group Filtering Commands

Currently I can filter groups by pressing one Group Palette then the "/" key, and then a selection of one or more other Group Palettes.
"Group 1 Palette" / "Group 4 Palette", "Group 5 Palette"

Can you make it possible to select one or more Group Palettes first as well?
"Group 1 Palette", "Group 2 Palette" / "Group 4 Palette", "Group 5 Palette"
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