I’ve updated the original post a bit probably while you were replying. Centralizing it in one page is an option, but what I like about the template approach is that it would also be natural to distribute these via Libraries this way and they can be split out and grouped with other templates. Like a meeting page template, a meeting snippet template and now a meeting style template.
I see the point with your “icon” with the space thing. I was contemplating of calling this “prefix” or something to allow any prefix text. Whether it’s emoji or something else. But… I can only really see the use case of emoji, not free form text. And if that’s the only thing you’d put there, deciding on a space there or not. Not sure.