I think that would work, yes. I’d just need to grab/store a copy of the doc and compare it to figure out what changed each time. A little extra work on my side, but I think it’d work 
One note – you’ll probably want to “debounce” the frequency of the notifications a bit somehow, to avoid sending bursts of a bunch of notifications e.g. for typing (one per character?!) or even checking off a series of items (do I get one notification per check? one per 10 seconds?). Not sure how that should work.
Thanks for considering!