Y’know, you could just make up accents in dnd. Tried to give ur character an Australian accent and failed? Well, there is no Australia in this fantasy universe, but there is conceivably a settlement of people who all speak in an accent which sounds, to our ears, like really bad Australian.
What I’m saying is just use the worst fuckong voices for all ur characters and if u get called out on then just say it’s how people talk in fricking green-mushrooms or wherever ur character comes from. Make your party suffer.