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I know for a bathtub in your home, they put down a big blob of mortar on the floor then set the tub on it. The mortar cures and supports the weight of the tub, water and person in it to prevent cracking.
I know for these showers they don't do that.
I'm wondering if you can access the drain hole from the bottom, would it help to inject just a little foam all around under the pan (not too much, it will lift the pan) to help support it (persons body weight) to help prevent the cracks from spreading.
I saw on another site where someone just wanted to refresh their shower. They painted it with Rust-oleum marine paint. For you this may help with waterproofing.
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