It was definitely legit in the sense of it being something completely counterable by my friend had she been looking out for it, and it certanly wasn’t an exploit. It did still feel dirty to make use of information that she hadn’t noticed to get her to defeat herself, particularly since it only worked by me carefully not saying anything about it for as long as it took to do
If we’re going to introduce a different way to write the voiced dental fricative, dh is the obvious sensible choice