The depth of the gorge of formal vests has not ALWAYS been low. Granted, it was low in the golden age of modern formal wear, but there have been two waves of high cut black tie vests since WWII. (and substantial periods in earlier centuries when high cut vests were the norm)

I do prefer a lower gorge for black tie, but I expect your vest will look great with a bow tie. If you aren't convinced, look for pictures of men in 3 piece (daywear) suits with bow ties. Those vests are almost always of the higher variety.

How is your vest bottom when worn over the kilt?

Too bad you aren't yet knighted- I suspect that is how The McGregor gets his medal.