A note to writers, when a stroke or other brain injury victim relearns speech the worst comparison you can make is "speaking french" or "like Steffi Graf" because it's not an acquired foreign accent syndrome, it's a brain injury.
It's a speech impairment. They're relearning how to form words. Just because one culture forms a rhotic R one way and another culture forms it another way or even deprecates it doesn't make you speak in their accent.
(Myabe a bit pedantic but I've always disliked this "my husband spoke French after his stroke") thing.
I admit .. "like Steffi Graff" signals how it sounds.
I had a weird experience with thankfully very temporary aphasia 20 years ago, which I wrote a bit about here: https://dmd.3e.org/2005-11-23-aphasia-and-back-sunday-20-nov...