I wrote some custom filtering when we do translations with nokyctranslate.com, which I run which filters out certain patterns like urls, e-cash nuts, etc. I mostly did it so that what is translated is shorter and thus cheaper. I’d be happy to work with you to integrate it as a paid translation option for your client. I did it on damus, which also supports another paid (non btc though, cc only) DeepL. I’m really excited about your client btw!