Some of your message is basically why support posts are rejected for the forums. There is no way to respond to some of it without having your actual configuration and in general posting your config to the forum isn’t a great idea.
The Samsung Q doesn’t make sense because you wouldn’t want to control a frame TV with a mechanism that used a long press. Setting up the proper IP control is the path.
AppleTV long press command simply already exists.
For Q3 change your receiver setting to reference volume and they will match.