See T181848: Experiment with using English Wikipedia models on Simple English. We're using the English Wikipedia models and it looks like they are useful. We're also working on building models dedicated to Simple English Wikipedia, but that'll require more work.
We should be able to get these models enabled for Simple English by Dec. 8th, 2017. So announcements to Simple English Wikipedia should start now. @Adotchar has been working with us (Machine Learning Platform)