I wonder how this would work if, for example, someone who never uses AI for writing decides to sometimes use AI for a sentence or string of sentences here and t

I wonder how this would work if, for example, someone who never uses AI for writing decides to sometimes use AI for a sentence or string of sentences here and there. Or vice versa, an AI addict makes themselves hand write half the sentences sometimes. Basically, putting a pebble in one's shoe to fool gait recognition, what's the equivalent thing for defeating stylometry?