Your search for "handlebar clip-on" revealed the following:
SCRAMBLER DUCATI MULTISTRADA V2 Handlebar bag
$114.90Made in fabric and customised with the Ducati logo: it is the indispensable accessory to have your personal belongings always...
MOTOCORSE Machined from Solid Brake and Clutch Oil Reservoirs Kit | 107147050
$667.00This product is created for people that have on the motorbike the Brembo semi-radial pumps but don't like hanging reservoirs...