I made a handlebar-mounted holder for my Mavic Pro remote control for a bike ride around Taiwan I did earlier this year.

The controller sits a little loose in the holder but a bit of foam on the inside bottom will make the controller fit snugly and will prevent any rattling noise. Really big bumps or potholes could jar the controller loose, so use at your own risk! For slow smooth rides, though, the holder worked like a charm.

The holder connects to the handlebar via a BioLogic AnchorStrap using an AnchorPoint mount. You can get them here:
https://buy.ternbicycles.com/products/biologic-anchorpoint-bar-mount
https://buy.ternbicycles.com/collections/cases-mounts/products/biologic-anchorstrap

Piloting a drone while riding a bike is never recommended. I merely used this to hold the controller while the drone automatically followed along in Follow Me mode.