The plain reality is that activation lock was created specifically to disable any iOS device accept to other than the owner who sets it up in the first place. If it could be bypassed or hacked, it would be an utterly useless and pointless feature.
And Apple does nothing for people in situations like yours specifically because they created a system that is 100% under the control of device owners. So it is 100% on owners to take responsibility for it and control of it. If an owner isn’t available, there is nothing you can do about it. There is nothing anyone can do about it.
Apple’s explicit approach is they will take no action of any kind unless someone can establish documented legal ownership of the device, through an original printed receipt, or a legal bequeathment. They may own the hardware that runs the system, but they don’t control who chooses to activate and use it, nor who chooses to disable it. They deliberately made it that way - a one-way blind theft deterrent system entirely under the willful control of device owners.
And then they put in place a detailed privacy policy that assures owners that they will never intervene on anyone else’s behalf without the explicit knowledge and consent of the owner. Nor will they violate an owners privacy and divulge their identity to anyone requesting it, nor intervene and make an unsolicited contact of the owner on behalf of anyone else. They are not the lost and found, nor are they law enforcement.