I’m not wholly familiar with your sitch but I think you’re pretty much spot on with your thought pattern and future plans. Your wife will learn the consequences of her actions including being offside with her brother.
I took my ring off about a month in. It felt really weird but it felt weirder keeping it on given the XWs treatment of me and resolve that it was over. Good luck mate!
Me: early 40's XW: nearly 50 T: 15 M: 5 BD: Jan 19 S:10 SS: 22 SD: 24