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The pressure won't bother the wheels. They wouldn't be able to put up with the stresses a car puts on them if mere low(ish) air pressure was a hazard.
Are you trying to go down a size in width for reduced rolling resistance or what? If so, you might want to consider the width of the actual grip on the tire. I've had tires in the same size with considerable difference in the contact patch width, one being "sporty" that had grip right to the outer edge of the tire, and a typical all season that curved in as it reached the tread...there was probably 1" total difference in the width of what touched the road.
Besides that, just changing down a tiny bit in tire width probably wouldn't make up for the cost and effort put in, unless you're due for tires anyway.
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