Omega does not sell just the insert. If you want a genuine replacement, swapping the entire bezel is the only way to get a new one.
On the open market you will pay a premium for one, so I would recommend you take the watch to a watchmaker with an Omega parts account who can purchase the bezel from Omega, and who has the tools to replace it. Removing the bezel improperly can damage both the bezel and the case.
For the crystal, depending on how deep the scratch is, it can take a great deal of time to polish out. Polywatch is meant for acrylic crystals - for sapphire you need various grits of diamonds paste, and a lot of time. If you do it yourself it might be worth it, but honestly the time I would have to charge for removing a deep scratch would probably exceed the price of a new crystal.
Cheers, Al
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