Your best bet (as with many compact camera repairs) is probably to find another one of the same model on eBay, advertised as “spares or repair” but with a body in reasonably good condition. They generally go pretty cheaply. Practice disassembly on that then you should be able to swap out the damaged parts on your own camera.
A quick Google search gave me a few disassembly videos for that model but not a disassembly guide, though you can find a service manual at
https://elektrotanya.com/sony_dsc-rx100_...
(Be sure to use the inconspicuous download link below the service manual preview, not the large download button which will only give you unwanted software.)
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