Working on a fine-tuning add-on currently :) The one I'm working with is called PPLM by Uber eng, and it takes a "bag of words" to keep generated text on topic.

Working on a fine-tuning add-on currently :) The one I'm working with is called PPLM by Uber eng, and it takes a "bag of words" to keep generated text on topic. It's not exactly what you're asking for (style transfer), but you'd be able to load it with your common email phrases, and the postprocessing will bias similar phrases, keeping it somewhat stylistically consistent.