I have a weird relationship to notifications. They kinda stress me, but I know as long as there are no notifications all systems are working fine and I can do w

I have a weird relationship to notifications. They kinda stress me, but I know as long as there are no notifications all systems are working fine and I can do whatever I want. What I would need is a dump smart watch with SIM card and proper battery lifetime and proper API so I can build from scratch and not start with android pushing everything on me.