You had a pre-JW life of 40 years, so you're one of the lucky ones. I also had a (much shorter) pre-JW life and had no other JW family members. It's easier for you than it was for me because I was married to a JW and had achild. I moved to another state on the other end of the country. I moved back to the town of the congregation I had attended for a short time, and I'm glad I did because they called me in for a JC meeting. I went begrudgingly. They were such asses that I could see clearly that they were full of themselves and arrogant bastards. They had nothing on me but tried to harass me into "confessing" to something so they could DF me.
All you have to do is stop attending and change your e-mail address and phone number. You also might want to move to a new location. If you don't have a great job, you might want to launch a nationwide job search and go elsewhere so they can't be bothered to hunt you down.
Don't let them get to you. They have no power over you other than what you give them. Don't give them ANY!
Best wishes!