Pressure cooking does make it a little softer. Not sure if it would help that much. If it is a size issue, perhaps pulse the cooked meat a few times in a food processor until it is finely ground but not paste.
If you want to spy on my food blog, you can find it here: Palatable Pastime
Try the cheaper, fattier ground beef. 73% lean, maybe. The extra fat will give it a softer, juicier mouth, and it will stay moister, easier to swallow. Tastier, too, if you're OK with a little more animal fat in your diet.
I've lost all my teeth at an old age and never did adapt to the false teeth made for me so I needed to change my eating habits. I can no longer eat crispy things. What I did was try/buy an Instant Pot pressure cooker so I could cook everything soft. I needed to break stuff down with my tongue using the roof of my mouth instead of with teeth. My slow cooker worked fairly well but this pressure cooker was perfect.
To answer your question, YES, you can cook stuff soft and you don't need teeth to eat it with. It can be broken down and cut up with a spoon. You can toss your knives out the window.
I've had mine a few months now and it was the answer to all my eating dilemma.
At my age, "Happy Hour" is a nap...