Delay sleep tracking: trigger sleep with Mi Band/trackable button

Would it be possible to add a feature where we could activate the delayed sleep tracking feature, and then the next press of the button on the Mi Band activated sleep tracking? My normal bedtime routing is this: get into bed, set SAA, set my phone horizontally on my wireless charger, microphone facing me, then hit the button to delay sleep tracking for 15 minutes. Afterwards, I’ll read my kindle for anywhere between 10-30 minutes, depending on how tired I am, how long the chapters are, etc. I use a 15 minute delay for sleep tracking just because I think it’s the closest I can get to being accurate, but it’d be great to be able to set delayed tracking and then just press the button on my Mi Band when I close my book, and not have to fiddle around with my phone on my night stand, which kinda wakes me back up. I feel like this would increase tracking accuracy as well… at least for me.