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Several years ago, there was a post on this site that probably answers your question. Unfortunately, I did not record the author or the title of that post. Within the approach of that old post a palette is created to insert all possible pairs of parentheses. Below I reproduce the code from that post: CreatePalette[ Column[{Style[ Grid[Join[ ...


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This works on DisplayFormula cells and satisfies all three requirements. Hope this helps. CreatePalette[{ Button["Insert Alignment Marker", NotebookWrite[InputNotebook[], "\[AlignmentMarker]"]], Button["Turn on Alignment", SelectionMove[InputNotebook[], All, Cell]; SetOptions[...


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