Some good ideas here I think.
I use the little dog idea because they are cheap to feed, easy to bathe, noisy as heck at the slightest provocation.
One not mentioned yet is some inexpensive (or as expensive as you want to go) electronic shooting muffs. Keep them by the bed and put them on first.
Amplified hearing allows you to stay in your bedroom and hear the bad guy(s) moving, talking, breathing in some cases so you are warned when they are close.
The thing that occurs when you touch off your 12ga, nice AR style rifle, 9mm (or any other) handgun in a confined area is a very loud noise that will ruin Beethoven for you forever.
I do mean permanently. As a bonus you may get tinnitus which is the cheery sounds of ringing in your ears at ALL times.
Amplified hearing protection is as much a defensive weapon as a hearing saver. It belongs next to your bright light (of which you have two there because 2 is 1 and 1 is none). Anyone with any low-light training knows exactly what that means.
When you need it, you will need a spare in case you drop, throw, lose or break your primary light. Seriously.
Consider pistol caliber rifles in any caliber (think of .22lr last) because they are powerful against man-sized predators and easy to shoot well. Much easier than a handgun is to shoot well. An inexpensive red dot sight will allow you to use focus on the target (which you will want to do anyway) and just put the dot where the bullet should go and press the trigger until you cannot see the target anymore.
Remember, you were in fear of your life or that of your family of innocents.
While all your points are good, I get a chuckle at how you put a discussion of how loud a gunshot is in the middle of a discussion of the need for amplified hearing aids ...