A bit annoying. Found a stone in between the rubber seal and the paintwork on the driver's side door sill today. My first scrape/chip in the new R

I've just ordered some RGM door sills (quite surprised the R doesn't have these on as standard as I'm sure the sills will get a fair bit of wear).
Now, I need to get the scrape sorted as it looks as though it's gone through the bare metal. Just wondering what the best course of action would be? OEM touch up paint? Chipex?
Door sill:
Underside of door:
