I wouldn't do it that way. The sensor is not a solid block of plastic and silicon. It's a bit of silicon with a cap over it and it contains air.
There is a small hole to keep it from exploding during the reflow process, but I would not count on that in your application.
Is there any way to create a window into your chamber and put the sensor on the outside?
The sensor really needs a coverglass to keep the elements from fowling the raw, exposed silicon.
By having the sensor look through a window of some sort, you protect the sensor and the same time as solving your pressure problem.
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