If I were to ask a question on using separate fonts to represent distorted or alien speech, <or enclose some kind of bracket to represent talking in another language>, how well would that question be received?
I don't think that kind of question is on-topic here.
I agree with Glorfindel's suggestion to consider Writers, since the help center says
Questions on these topics are welcome here:
- Non-fiction, technical, scholarly, or journalistic writing.
- Writing fiction, poetry, or song lyrics.
- General copywriting, style, and organization.
Another possibility for questions about typography is the Graphic Design Stack Exchange.
However, keep in mind that questions that seem like "idea generation" (per the Writers help center) or "Brainstorming or idea gathering" (per the Graphic Design help center) are broadly off-topic on all Stack Exchange sites. So make sure your question is narrow enough in scope to avoid falling into one of these categories. For example, rather than asking "How can I use typography to indicate talking in another language?", which if taken literally could be answered with anyone's opinion, you might ask "What techniques are commonly used in published novels/graphic novels to indicate talking in another language?", which implies that answers should be based primarily on facts rather than on opinion and which narrows the scope to whatever category of literature you're interested in.
Some kinds of questions about typography are on-topic for ELU. The exact lines are probably blurry, but I would say that the main thing that makes a typography question on-topic here is some element of specificity with regard to the English language; it also helps if the question is clearly objective and interesting.