When I had my intex donut, I dug in a circle of landscape edging (the 8" tall stuff with a black tube on top) and I levelled that as I installed it. Then I filled the inside level with sand and back-filled the outside with soil and grew grass on it. The highest part was about 4" exposed before backfill. I think the crushed lime would work great but you may want some provision to keep it from washing out. If it's sharp, you may consider a layer of sand below the ground cloth to protect the liner (and feet).
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