• I'm ok with a partially external cable routing.

    The only issue with having no holes at all is you will have to run the L to R e-wire under your stem, would look a touch shit.
    Also from the images in the RS910 manual, i think Shimano expect you to run the L to RS910 wire along the outside of the bar, then drill a small hole in order to enter the bar near the bar end plug

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