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@Five-Hats
Having done something similar I would whip the cranks off and see if a) can you get into the chainstay from inside the bottom bracket, and b) is there a breather hole at the end of the chainstay big enough to get a thin bit of 2-core cable (I used the inside of a headphone cable for that) through: https://www.lfgss.com/comments/14780943/ .
Personally I'd use a Di2 cable sticker on the downtube and not drill that, but if you can get into the chainstay from inside the bottom bracket and out the other end, then a hole underneath the bb won't hurt and there's probably already one there to hold the cable guide on.