Like to keep my bars/stem clean so I use a 910XT watch for data recording. Using a Garmin cadence sensor (new style) and often miss having current cadence available at a glance without having to look at my wrist.

Looking for unobtrusive unit I can mount on the bars/stem that will read and display the ANT cadence data (literally I'd be happy if that's all it did) from the Garmin sensor. Not really looking to drop $129 on an Edge 20, but that's about the right size imo.

Does such a gadget exist?