To my knowledge there is no way to replace just the insert with the branding on it, you would need to just order new sills.
Fortunately they're less expensive than you'd think for the front pair, when I looked into this for my M6 GC, they were only ~$150 for the front set.
Mine just had a few scuffs on the clear coated part, so I taped off the black plastic and took a Rupes Nano to it with some polish and they came right out. Trimmed some Xpel clear film to go over it to prevent having to touch them up all the time.
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