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Don't know if it makes you feel any better but Paul Pratt (maker of the Cafelat Robot) says that lever machines rarely make it to (and don't require) 9 bars of pressure, most are happy in the 5-7 range.
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So basically something to hold the Aeropress in place and then the lever attached to the plunger? I reckon the rubber seal would hold. Would also need to make sure that the pressure doesn't break the cup (apparently it's possible with hand plunging).
withered_preacher
Monster1985
@Jonny69
Dagnabbit, you've got me designing the damn thing now.
Key thing working against it is the big diameter (63.5mm). Pressure = Force / Area. Area is 3167 mm^2 = 0.003 m^2. 9 Bar = 900,000 Pa. Load is therefore 2850 N (285 kg) to make 9 Bar of pressure. With a 10:1 lever ratio, we can bring that down to a more manageable 28 kg. The question becomes more about whether the rubber seal can hold that pressure and if it can take 285 kg on the back of it.
So, realistically, leaning your weight on an Aeropress actually only makes between 1 and 2 Bar pressure depending how much of your weight is actually on it. I'd never really considered what it made before.