That’s a proprietary software problem rather than a being connected to the internet problem. One of the send-a-notification-when-it’s-done devices I set up took about as much effort as setting the right time on a phone alarm about ten times because the device’s firmware was open source with no companies’ bullshit involved, so all I had to do was navigate to the right page in Home Assistant and pick the right phone from a dropdown and the right even for the notification to trigger on from a dropdown. That’s not wildly different from picking the right time from a dropdown on a phone.