Ha! I hear you. I would not attempt to do an impression myself with just the tools my pro has. But, if there is a safe process made for home use I might try it. It would have to have a guard or some way to keep it from going too deep, other than feeling pain.
I’ve taken them back several times and talked a lot about what I want and my pro seems to agree, but it doesn’t get done. There is nothing else i can say. Either they are unwilling or unable to get it right. I don’t know which it is. Neither one makes sense.
So I will try to go somewhere else for an ear mold, if I can get a local pro to agree to just make a mold, knowing they are not going to get any more of my business. I guess it would be similar to a normal hearing person getting an impression and custom hearing protection.