Wow it’s 5:14 AM where I’m at and did not think I’d get a reply so fast haha! So I would tap into the neutral of the light fixture and bring a neutral down to switch 3. Then how to do I give the other switches neutrals? Can I repurpose the traveler and make them neutrals? And not use travelers and travelers?
I was reading from another post of yours in a different thread to have better understanding of add-on switches. I think what I plan on doing is test if that white bundle I have in the wall is really the load (line switched) and not the neutral. If it is the load then I would drop a wire from light to master to provide a neutral for switch 3. The original “line switch” will then plug into the load and I can repurpose all the old out “line switch” to the neutral and provide neutrals to my 3 add ons.