Glad no one thought my idea was stupid
I used full length housing guides since it is a gravel bike...mine were mounted to my 7/8” dia chainstays so like $8 each:
https://www.paragonmachineworks.com/...7-8-miter.html
If you want a true cable stop for 34.9 mm tube it would be something like this:
https://www.paragonmachineworks.com/...3-8-miter.html
Hope this helps!