This sounds miserable. Use your phone whenever you feel like it. Charge your battery whenever you want. If things get really bad in a few years from now and your battery doesn’t last, you can replace it for $50. It’s not a big deal.

I’ve had my phone for a little over 4 years. I charge overnight to 100% every night. I sit it on a wireless charging pad when I’m at my desk whether it needs it or not. I still get 5-6 hours on a charge. That’s pretty good for a 4 year old battery.