Is it possible to make a dialogue info work if it has no responses? And would the start/end script fragments still work? I'm assuming the answer is no, but I want to be sure.

And if it's not possible, what about making empty responses. I really want some silence in my dialogue and I don't want any subtitles to be shown...

It is possible to create "empty" responses with SKSE's localization. Make the text/subtitle part of the response into a unique string that will then be replaced by an empty string via a text file in \Skyrim\Data\Interface\Translations\MODNAME_LANGUAGE.txt. The text file should contain the unique string and the empty string, but separated by a tab.

I use a bunch of these for the menu of the crafting services feature. Each topic is an option and each empty response is there to do stuff in the script fragment. The response is "$ILMA_InvisibleDialogue" and the translation file contains "$ILMA_InvisibleDialogue " (that space at the end is actually a tab).

https://github.com/schlangster/skyui/wiki/MCM-Advanced-Features#wiki-Localization

Sounds interesting but not so easy as I would like it to be Maybe I'll look into that at some point. Strings are something I haven't worked with so far.

BUT - I would really like to do it without using SKSE though. Is there any other possible way to go?