I've used bedwetting alarms with diapers, but not in the same way. Here I'm talking about something like the Malem Ultimate alarm:
The setup, working out from the innermost layer, is usually:
- Diaper, maybe with a booster.
- Cloth pocket diaper or other diaper cover, or fixation pants, or simply cloth underwear.
- Clip-on bedwetting alarm sensor attached to the cloth layer.
- Plastic bloomer.
Thus when the diaper leaks, the bedwetting alarm goes off and you still have some time before the wetness will leak past the bloomer.
If I'm at home I can use this setup to go for hours without thinking about my diaper. Only when the alarm goes off do I have to consider whether to change. If I'm out doing errands, the alarm going off tells me that I need to think about changing or heading home. The Malem alarm can be set to vibrate-only, so it can be discrete in public.
Either way the idea is that something outside of me is monitoring the state of my diaper. I can't really explain why this is such an advantage, but it helps me to get into the right mindset.