You can easily do this by just giving them a throwaway email. They don't check. Legally they just have to record your name but there's nothing saying you have to give them a real email.
That's not engagement, it's passive consumption. The system only works if sufficient people are part of the process, and that takes at the very minimum two way communication.
I mean this specifically in America, but does "political engagement" even do anything here? Pretty sure the battle lines have been drawn and you're either spamming or preaching to the choir.
You could use your engagement to live a live infused with your values, as a beacon to other like minded people, or people who were unaware they were like minded, until they saw your light in their tunnel.
I had to yell at Red Cross once. I was getting calls maybe 2-3x a week to go donate blood in areas almost 200 miles away. It was obscene. The caller never could seem to understand why I wouldn't rush down there.