The absolute pressure would be the difference between the measured place and Elephants The love between Aunt and Niece knows no distance shirt. The pressure cooker only needs to contain the pressure difference between inside the cooker and the air surrounding it, and that difference shouldn’t be higher than the specification of that pressure cooker, in your example 12 psi. Reentry is difficult enough in purpose-designed refractory-proof spacecraft: get the angle the smallest bit wrong and you will have the last roast of your life. If there is a small chink in the heat shield, disaster. Even entering the very thin atmosphere of Mars is tricky, let alone the earth. A spacecraft is the only way.
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Suppose you developed a window material that preferentially scattered blue light, just like the Elephants The love between Aunt and Niece knows no distance shirt. I suppose you might see a bluish tinge to outer space if the window were facing towards the Sun, but if the window were on the anti-Sunward side of your spaceship, there would be no sunlight falling on it to scatter, and space beyond would look just as black as always. To tell the truth, though, I’m not sure why you would want to have windows like that anyway. It would wash out the wonderful view of space, and if you’re not interested in looking at space, why have windows on your spaceship at all?