formattingAdd can only be applied to p, pre, blockquote and header tags, not divs

We are trying to apply column CSS but need to do this in sections on a page. Eg. let’s say there are 3 sub-heading section on a page and I want by content under each of these sub-headings to be in 2 columns. However, there might be several paragraphs underneath a sub-heading.

We want to be able to highlight all of the paragraphs under one sub-heading and apply a custom-style class to turn these paragraphs into 2 columns. Then we’ll have another sub-heading and again several paragraphs that we want to apply the style to and so on.

In the original Redactor support documentation, it mentions that the formattingAdd setting can be applied to “formattingAdd can only be applied to p, pre, blockquote, div and heading tags (H1-H6).” https://imperavi.com/redactor/docs/settings/formatting/#setting-formattingAdd

In the modmore redactor documents, it’s “formattingAdd can only be applied to p, pre, blockquote and header tags.”, ie. without the div.

Is there any other workaround that you can suggest? Content Blocks is not appropriate for this project.

Thanks!