A simpler solution may be to use an en dash, even though they are not interchangeable and em dashes are the proper punctuation for parenthetical phrases. As a typography pedant, I’m annoyed that LLMs have forced us to talk about this.
Of course, if we collectively shifted to the spaced en dash then LLMs would eventually follow; it's not clear to me that any simple and deliberate sign of humanity could remain exclusive given the incentives for machines to replicate it.