My Fitbit Inspire 3 (cheapest fitbit, comes with 6 months Fitbit premium so you can see how your sleep is and address any issues) has alarm vibration options and it is (usually) enough to wake me. Never wakes the wife. If you sleep with her on your arm or something, then this probably won’t work. They also have light alarms (goes from dark yellow to bright white over a 30 minute period) and she could wear a sleep mask.
Why? I prefer being seen by less people. I assume companies are less likely to archive bot replies. Curious if there are reasons against it.