What a navy could do with surviving 1850s steam ships

What operational use could the Royal Navy find for three pristine 1850s steam ships of the line?

None at sea; they could serve only as stationary accommodation hulks in shipyards.

By the mid-twentieth century an 1850s steam ship would be almost a century old even if its visible fabric appeared pristine. Machinery, structure, and fighting systems make operational reactivation unrealistic. The hull could not contribute useful speed, weapons, or survivability to a modern fleet. Its remaining value would be sheltered accommodation or storage in a dockyard where movement and combat capability were irrelevant.