Maybe just 3d print another clamp to hold it to the bars in a more aero looking shape. Or eliminate what you can on it's backside and 3d a bezel to go around it and hold the bezel down with the tape you wrap the bars with.
You know that your Garmin device can give you that same screen and more if you have the wifi option. Maybe Wahoo and others do too. I set my top button on my STI's to let me control the screens shown on my Garmin 530.