Any wiring diagrams for GE 3 dimmer way with the line power going to the lights and then out to the switches?
Almost positive you will find your case here:https://community.smartthings.com/t/faq-ge-3-way-wiring/?source_topic_id=116843
Yes that thread is correct place to get answer. I’m pretty sure if your line is coming into the light box 1st. Then your going to have to go the micro route or pull some wire.
Not always. I had a few of these but in each case I still had a neutral wire on the same breaker in the box from a different light circuit. So it was possible to reconfigure the wiring.
In another case I had another lighting circuit on a different breaker in the box, so I could undue the power into the fixture and change which breaker the 3-way was on.