> prove compliance of a less invasive lip oriented device would be lower than current invasive devices

I can't prove it, but I think it actually makes a lot of sense. The interstitial CGMs like Libre/Dexcom are invasive (brief pinch on application) but they last up to 2 weeks and you can set and forget. I'd think any other non-invasive device that requires carrying it around, running wires, and being even a little pro-active would lose on convenience alone.

You could get some traction I'm sure, but the majority of people are going to gravitate towards the easiest solution, and applying a patch once every 10-14 days is pretty darn easy. Even if Apple could check glucose I'd still prefer a CGM patch so I don't have worry about always wearing the watch.