https://www.paulcomp.com/shop/compo...mounting-solutions/funky-monkey-cable-hanger/
Or I've got this one on my cx bike. No idea of brand but it's 1" and if you can find one it will no doubt be a fair bit cheaper than a Pauls. If nothing else it proves options exist. If you are in the UK check SJS cycles, it's the sort of thing they will have.