Many many ways!
I can open motorised locked via HA ( app or web based ) . Currently door has finger scanner ( though it's broken at the moment!! )
When working! - triggers a relay that homeseer can detect which in turn triggers a fibaro relay on the lock
The unifi access reader pro does sound promising. But as you said some 'features ' don't exist yet.
The thing that hacks me ( like ring ) is the subscription and also the video/audio isn't accessible too me i.e. propariatory . Doorbird stuff is accessible. Therefore integrates with blue iris which in turn integrates with Homeseer.
Though it's way to expensive for a bloody video doorbell - I *think* door bird is the way to go - tempted to push the button on a purchase!
( did also look at arlo, arcrest etc. etc. )