That is the perfect solution to what I described, but it's a bit pricey.
I have not been able to find any information on pressure vs. resistance for piezo elements.
The output is really "spiky" though. You have to process and filter the input a LOT to get clean(er) pressure measurements, and it's still not entirely perfect, so I can't say for certain how well this might work for your application. But it's inexpensive enough that it might be worth a trip to Radio Shack to get a couple test parts to experiment with.
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