Without an explicit example I can only guess that if inserting <br> is good enough for you then you can get the same effect by adding a class to the paragraph that is created by default to remove any margins and paddings from it. This of course is not a good semantic solution but I haven’t seen many people actually caring about semantics.
The other option is to write some code and create a [br] shortcode to use wherever you need to insert a <br>. This plugin – https://wordpress.org/plugins/line-break-shortcode/ is a little stale but I can’t think of any reason it should not work.
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