superchow -
From what I've read, no one seems to think that there will be harm to the engine.
Aside from all the other caveats, it sounds like you could at least do a test. Leave the car parked in neutral and let it idle while the dry ice is off-gassing into the intake. This wouldn't be a complete test, but you could at least see if the engine bogs down under a controlled/safe idle/min-load condition. You could also press the accelerator and see if it runs "normally" at different RPMs. If you don't like what you see or hear, just turn the engine off and pull out the dry ice.
I don't blame you for thinking in terms of non-invasive mods. I'm a proponent of the "reversible mod", and the politics of sharing one car can be verrry complicated.
CarloSW2
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