Electrical cables - clamps vs inside handlebars (2017 FortyEight) - cross-posting from /r/

Just installed 14" apes on my 2017 FortyEight and I have a dilemma: handlebars are made for internal wiring however I heard people saying that running it internally could potentially lead to some issues as HD vibrates, cables can get damaged inside tubing and start acting up therefore I was told to put cables outside the handlebars. Still fighting with the idea of having electrical inside though statement earlier makes sense. So 2 questions:

1. what's your opinion running it inside vs outside ?
2. if I go with outside option, zip-ties are the only option in my garage unless there are some other more-aesthetic ideas how to clamp cables to the handlebars.

thanks for your inputs !