Using one esri reprojectior transformer with multiple inputs and getting the feature type after transformation

I’m using the Esri Reprojector transformer with a feature reader that reads feature classes from an ArcSDE connection. They all share the same coordinate system and I need to transform them. I can do this successfully using three separate transformers but seems a bit silly. I’m assuming there is a way that I only need to use one and feed the three feature classes through it? I’ve tried doing this and adding a FeatureTypeFilter transformer but this returns no values if I click ‘Update’.