Out of curiousity, do you ask your editing system for diffs? Seems to me like the best way to notice and review whether your "voice" is degrading.

Personally I would never let an LLM touch my prose (although I'd happily use it for research and paraphrase things it told me), but if I force myself to consider the idea, that seems like the first thing I'd want. Maybe upon reading a diff you'd even consider going a third way with the text.