Are you taking the clip ons on and off the bike, or do they stay on the bike?
Do you have any other shift buttons, or just the brifters and the buttons on the clips?

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Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
Coaching and bike fit - http://source-e.net/ Cyclocross blog - https://crosssports.net/ BJJ instruction - https://ballardbjj.com/

They'll probably stay on but I'd like to have the option to be able to take them on and off.

I have the shifters on the hoods with the brakes and the buttons on the clip ons and that's all

The PRO Vibe handlebar and stem can hide junction box in the stem, but I am not sure how it may work with the clip-on.

Do you have Shimano DI2 brake levers (brifters) or something else with shift buttons added? If di2 levers, and If clips are staying on the bike, just plug them in to the brifters. There's a single active junction on hydro levers, and a single active and single passive (momentary "sprint shift") junction on cable brake brifters.

Honestly, If you're looking to hide junction and you're taking bars on and off, I'd probably do this as well. It's easier to unwrap a bit of bar tape then it is to take stuff apart to get to a hidden junction box. That said, great thing about DI2 and an under stem junction box is how easy it is to take clip ons with shifters on and off the bike...

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Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
Coaching and bike fit - http://source-e.net/ Cyclocross blog - https://crosssports.net/ BJJ instruction - https://ballardbjj.com/

I have the di2 levers

I probably won’t be taking the aero bars off too often at all guess I just want the option to easily change.

Yeah, the Pro Vibe stem is the solution here. I went from this:




to this:



Sorry I don't have better pictures. I bought a full tri bike not long after this picture with the new stem.

any options that are a bit sleeker looking?

I was looking at the Enve aero carbon stem but I can't tell if that is capable of hiding cables and haven't received a response from Enve yet.

I like the look of the BMC aero stem but it's made of aluminum. Not sure how to feel about that?

I'm surprised I haven't found a lot more options...