Garmin makes a combo mount for VIRB (lights, camera, etc) that uses standard go pro mounts. It includes a twist on/off quick connect to attach to the bottom of the mounting bracket.

Garmin VIRB Ultra Cycling Combo Mount https://www.amazon.com/..._api_i_T6SBCbE6T1CM4

Edit: just realized you asked about mounting to the aero bars. The Garmin mount is too long to attach to an extension and still be centered.